Document:

<PAGE>

                                                                     Exhibit 4.9

                        AMENDMENT NO. 4 AND WAIVER TO THE
                                CREDIT AGREEMENT

                                                      Dated as of March 31, 2003

          AMENDMENT NO. 4 AND WAIVER TO THE CREDIT AGREEMENT among DRESSER,
INC., a Delaware corporation (the "U.S. Borrower"), and D.I. LUXEMBOURG
S.A.R.L., a corporation organized and existing under the laws of Luxembourg (the
"Euro Borrower", and, collectively with the U.S. Borrower, the "Borrowers"), DEG
ACQUISITIONS, LLC, a limited liability company organized and existing under the
laws of Delaware ("DEG Acquisitions"), DRESSER HOLDINGS, INC., a Delaware
corporation ("Dresser Holdings"), the Subsidiary Guarantors party to the Credit
Agreement referred to below (the "Subsidiary Guarantors"), the banks, financial
institutions and other institutional lenders party to the Credit Agreement
referred to below (collectively, the "Lenders"), WELLS FARGO BANK TEXAS, N.A.,
as the swing line bank, MORGAN STANLEY & CO. INCORPORATED, as collateral agent
(the "Collateral Agent"), MORGAN STANLEY SENIOR FUNDING, INC., as administrative
agent (the "Administrative Agent") for the Lenders and CREDIT SUISSE FIRST
BOSTON, as syndication agent (the "Syndication Agent", and together with the
Collateral Agent and the Administrative Agent, the "Agents").

          PRELIMINARY STATEMENTS:

          (1) The Borrowers, DEG Acquisitions, the Subsidiary Guarantors, the
Lenders and the Agents have entered into a Credit Agreement dated as of April
10, 2001, as amended by Amendment No. 1 thereto dated as of March 13, 2002,
Amendment No. 2 thereto dated as of June 17, 2002 and Amendment No. 3 thereto
dated as of December 11, 2002 (such Credit Agreement, as amended, supplemented
or otherwise modified through the date hereof, the "Credit Agreement"). Dresser
Holdings has entered into an Assignment and Assumption Agreement dated as of
July 3, 2002 with DEG Acquisitions whereby Dresser Holdings assumed the duties
and liabilities of DEG Acquisitions under the Credit Agreement and Security
Agreement. Capitalized terms not otherwise defined in this Amendment No. 4 and
Waiver have the same meanings as specified in the Credit Agreement.

          (2) The Borrowers have requested that the Lenders (i) amend certain
provisions of the Credit Agreement and (ii) waive certain requirements of the
Credit Agreement for a specified period of time as provided herein.

          (3) The Lenders party hereto, constituting not less than the Required
Lenders are, on the terms and conditions stated below, willing to grant the
request of the Borrowers as hereinafter set forth.

          NOW, THEREFORE, for good and valuable consideration the sufficiency of
which is hereby acknowledged, and subject to the terms and conditions of this
Amendment No. 4 and Waiver, the parties agree as follows:

<PAGE>

                                        2

          SECTION 1. The Amendment. Subject to the satisfaction of the
conditions precedent set forth in Section 3, the Credit Agreement is, effective
as of the date hereof, hereby amended as follows:

          (a) The following definitions are hereby added to Section 1.01 of the
     Credit Agreement in the correct alphabetical order:

              ""Amendment No. 4 and Waiver " means Amendment No. 4 and Waiver
          to this Agreement dated as of March 31, 2003 among the Borrowers, DEG
          Acquisitions, the Subsidiary Guarantors, the Lenders party thereto and
          the Agents."

              ""Amendment No. 4 and Waiver Effective Date" has the meaning set
          forth in Section 3 of Amendment No. 4 and Waiver."

              ""Suspension Period" means the period of time beginning on the
          Amendment No. 4 and Waiver Effective Date and ending on the earlier of
          the (i) the date that is 125 days after the Amendment No. 4 and Waiver
          Effective Date and (ii) the date on which the Agents receive (x) the
          audited annual financial statements for the U.S. Borrower and its
          Subsidiaries for the Fiscal Year ended in 2002 and (y) the revised,
          audited financial statements for the U.S. Borrower and its
          Subsidiaries for the Fiscal Year ended in 2001, in each case, in
          accordance with the requirements set forth in Section 2(b) of
          Amendment No. 4 and Waiver."

          (b) The definition of "Applicable Margin" in Section 1.01 of the
     Credit Agreement is amended by adding at the end thereof the following new
     sentence:

              "Notwithstanding anything herein to the contrary but subject to
          the immediately succeeding sentence, for all purposes of the
          Agreement, the Applicable Margin shall be at Level VI during the
          period beginning on January 1, 2003 and ending on the date that the
          conditions set forth in Section 2(b) of Amendment No. 4 and Waiver are
          met, and thereafter shall be determined in accordance with this
          definition without giving effect to this sentence. During the
          Suspension Period, for all purposes of the Agreement, the Applicable
          Margin in effect from time to time pursuant to any of the foregoing
          for each of the Eurodollar Rate Advances and the Base Rate Advances
          shall increase by 0.50% per annum. "

          (c) The definition of "EBITDA" in Section 1.01 of the Credit Agreement
     is hereby amended by adding at the end thereof the following new proviso:

              ", provided, further that, for purposes of each of the second,
          third and fourth fiscal quarters of the Fiscal Year ended in 2002,
          Consolidated EBITDA of the U.S. Borrower and its Subsidiaries shall
          mean, respectively, U.S.$47,700,000, U.S.$46,900,000 and
          U.S.$29,400,000.

<PAGE>

                                       3

          (d) The definition of "Permitted Acquisition" in Section 1.01 of the
     Credit Agreement is hereby amended by amending and restating in its
     entirety clause (f) thereof to read as follows:

              "(f) (1) during the Suspension Period, the aggregate
          consideration for such acquisition (together with any Investment made
          during the Suspension Period in accordance with Section 5.02(f)(ix))
          shall not exceed $2,000,000 and (2) at any time after the termination
          of the Suspension Period, the aggregate consideration for such
          acquisition, when added to all such consideration for all such prior
          acquisitions (not taking into account the Pending Acquisition but
          taking into account any acquisitions made during the Suspension
          Period), shall not exceed the sum of (i) U.S.$95,000,000 and (ii) the
          lesser of (A) U.S.$50,000,000 and (B) the aggregate amount of all
          payments on the Tranche A U.S. Term Advances, the Tranche A Euro Term
          Advances and the Tranche B Term Advances previously made from (x)
          Excess Cash Flow, (y) Net Cash Proceeds from any sale, lease transfer
          or other disposition of any assets, or (z) optional prepayments."

          (e) Section 2.02 of the Credit Agreement is hereby amended by adding a
     new clause (g) at the end thereof to read as follows:

              "Notwithstanding anything in this Credit Agreement to the
          contrary, during the Suspension Period, at any time at which the U.S.
          Borrower and its Subsidiaries hold cash or Cash Equivalents in an
          aggregate amount equal to or greater than U.S.$70,000,000, the U.S.
          Borrower shall not request the making of Revolving Credit Advances
          (other than Revolving Credit Advances used to repay Letter of Credit
          Advances) or Swing Line Advances, and the Revolving Credit Lenders and
          the Swing Line Bank, respectively, shall have no obligation to make
          any such Advances."

          (f) Section 3.02 of the Credit Agreement is hereby amended by adding
     at the end thereof the following new sentence:

              "In addition to any of the certificates, opinions and other
          documents that may be requested pursuant to the immediately foregoing
          clause (b), during the Suspension Period, on the occasion of each
          Borrowing, the U.S. Borrower shall deliver a certificate to the
          Administrative Agent to the effect that (1) prior to the making of the
          proposed Borrowing, the U.S. Borrower and its Subsidiaries do not hold
          cash or Cash Equivalents in an aggregate amount equal to or in excess
          of U.S.$70,000,000 and (2) after giving effect to the proposed
          Borrowing, the U.S. Borrower will be in pro forma compliance with the
          financial covenants set forth in Section 5.04."

          (g) Section 5.01(i)(iv) of the Credit Agreement is hereby amended and
     restated in its entirety to read as follows:

<PAGE>

                                       4

                    "(iv) at any time after the expiration of the Suspension
               Period, the payment of customary annual management, consulting
               and advisory fees and related expenses to the Permitted Investors
               and their Affiliates made pursuant to any financial advisory,
               financing, underwriting or placement agreement or in respect of
               other investment banking activities, including, without
               limitation, in connection with acquisitions or divestitures which
               are approved by the board of directors of the U. S. Borrower or
               such Subsidiary Guarantor in good faith in an aggregate amount
               not to exceed $5,000,000 per year;"

               (h) Section 5.01(k) of the Credit Agreement is hereby amended by
          adding the following clause (iii) at the end thereof:

               "(iii) Within 90 days of the Amendment No. 4 and Waiver Effective
          Date, the U.S. Borrower hereby agrees to deliver to the Administrative
          Agent, with sufficient copies for each Lender Party, deeds of trust,
          trust deeds, or mortgages, in substantially the form of Exhibit E and
          covering the properties set forth on Schedule I to Amendment No. 4 and
          Waiver (together with the Assignments of Leases and Rents referred to
          therein, the "Additional Mortgages"), duly executed by the appropriate
          Loan Party in form required for filing or recordation in all filing or
          recording offices that the Administrative Agent may deem necessary or
          desirable in order to create a valid first and subsisting Lien
          (subject to any Liens permitted by Section 5.02(a) existing as of the
          Amendment No. 4 and Waiver Effective Date) on the property described
          therein in favor of the Collateral Agent for the benefit of the
          Secured Parties together with (A) evidence that all filing and
          recording taxes and fees have been paid, (B) fully paid American Land
          Title Association Lender's Extended Coverage title insurance policies
          (the "Additional Mortgage Policies") in form and substance, with
          endorsements available in the States in which the mortgaged properties
          are located, and in the amounts indicated on Schedule I to Amendment
          No. 4 and Waiver issued, coinsured and reinsured by title insurers
          reasonably acceptable to the Administrative Agent, insuring the
          Additional Mortgages to be valid first and subsisting Liens (subject
          to any Liens permitted by Section 5.02(a) existing as of the Amendment
          No. 4 and Waiver Effective Date) on the property described therein,
          free and clear of all material defects and encumbrances, excepting
          only Liens permitted by Section 5.02(a) existing as of the Amendment
          No. 4 and Waiver Effective Date, and providing for such other
          affirmative insurance and such coinsurance and direct access
          reinsurance as the Administrative Agent may deem necessary or
          desirable, (C) the Assignments of Leases and Rents referred to in the
          Additional Mortgages, duly executed by the appropriate Loan Party, (D)
          evidence of the insurance required by the terms of the Additional
          Mortgages, (E) favorable opinions of local Counsel to the Lender
          Parties with respect to the Additional Mortgages, and (F) evidence
          that all other actions necessary or desirable in order to create valid
          first and subsisting Liens (subject to any Liens permitted by Section
          5.02(a) existing as of the Amendment No. 4 and Waiver Effective Date)
          on the property described in the Additional Mortgages has been taken."

               (i) Section 5.02(f) of the Credit Agreement is hereby amended by
          adding at the end of clause (ix) thereof the following new proviso:

<PAGE>

                                       5

               ", provided further that during the Suspension Period, the
               aggregate amount of Investments made in accordance with Section
               5.02(f)(ix) together with the aggregate consideration paid in
               respect of any Permitted Acquisitions made during the Suspension
               Period shall not exceed U.S.$2,000,000."

               (j) Section 5.02(g) of the Credit Agreement is hereby amended by
          adding the phrase "at any time after the expiration of the Suspension
          Period," at the beginning of each of clauses (iii) and (v) thereof.

               (k) Section 5.02(n) of the Credit Agreement is hereby amended and
          restated in full to read as follows:

                   "(n) Capital Expenditures. Make, or permit any of its
               Subsidiaries to make, any Capital Expenditures that would cause
               the aggregate of all such Capital Expenditures made by the Parent
               and its Subsidiaries (excluding expenditures made with Net Cash
               Proceeds that shall have been reinvested in accordance with this
               Agreement and the reimbursement of insurance proceeds) in any
               period set forth below to exceed (1) during the Suspension
               Period, U.S.$15,000,000 and (2) at any time after the expiration
               of the Suspension Period, the sum of (a) 25% of the increase (the
               "Increase Portion") in Consolidated Pro Forma Adjusted EBITDA due
               solely to the consummation of a Permitted Acquisition or Pending
               Acquisition during such period or any prior period (such Increase
               Portion to be applied pro rata for the remaining of the Fiscal
               Year in which such Permitted Acquisition or Pending Acquisition
               is consummated), and (b) the amount set forth below for such
               period:

               ======================================================
                       Fiscal Year Ending In              Amount
                                                          ------
               ------------------------------------------------------
                  December 31, 2001                U.S.$48,000,000
                  December 31, 2002                U.S.$50,000,000
                  December 31, 2003                U.S.$53,000,000
                  December 31, 2004                U.S.$56,000,000
                  December 31, 2005                U.S.$59,000,000
                  For each Fiscal
                  Year thereafter                  U.S.$62,000,000
               ======================================================

                   Notwithstanding the foregoing, in the event that the amount
               of Capital Expenditures permitted to be made in any Fiscal Year
               (before giving effect to any increase in such permitted
               expenditure amount pursuant to this sentence) exceeds the amount
               of Capital Expenditures made during such Fiscal Year, such excess
               (the "Rollover Amount") may be carried forward and utilized to
               make Capital Expenditures in the next succeeding Fiscal year,
               provided that in no event shall the aggregate amount of Capital
               Expenditures made during any Fiscal Year pursuant to this
               sentence exceed 150% of the Capital Expenditures that would be
               permitted to be made but for the provisions of this sentence;
               provided, further that the amount set forth above for the Fiscal
               Year ending December 31, 2003 shall be

<PAGE>

                                       6

         reduced by the aggregate amount of any Capital Expenditures made during
         the Suspension Period."

         (l)   Section 5.04(a) of the Credit Agreement is hereby amended and
restated in its entirety to read as follows:

               "(a) Total Debt/EBITDA Ratio. Maintain at the end of each fiscal
         quarter of the U.S. Borrower a Total Debt/EBITDA Ratio of not more than
         the amount set forth below for each period set forth below:

         ===============================================
                 Quarter Ending                  Ratio
         ===============================================
         March 31, 2002                        4.90:1.00
         June 30, 2002                         4.90:1.00
         September 30, 2002                    4.90:1.00
         December 31, 2002                     5.50:1.00

         March 31, 2003                        5.75:1.00
         June 30, 2003                         5.95:1.00
         September 30, 2003                    5.95:1.00
         December 31, 2003                     5.30:1.00

         March 31, 2004                        5.00:1.00
         June 30, 2004                         4.80:1.00
         September 30, 2004                    4.50:1.00
         December 31, 2004                     4.10:1.00

         March 31, 2005                        3.75:1.00
         June 30, 2005                         3.75:1.00
         September 30, 2005                    3.75:1.00
         December 31, 2005                     3.75:1.00

         March 31, 2006                        3.25:1.00
         June 30, 2006                         3.25:1.00

         September 30, 2006                    3.25:1.00
         December 31, 2006                     3.25:1.00

         For each fiscal quarter thereafter    3.00:1.00
         ===============================================
        "

         (m)   Section 5.04 (b) of the Credit Agreement is hereby amended and
restated in its entirety to read as follows:

               "(b) Interest Coverage Ratio. Maintain at the end of each fiscal
         quarter of the U.S. Borrower an Interest Coverage Ratio of not less
         than the amount set forth below for each period set forth below:

<PAGE>

                                       7

               ================================================
                     Quarter Ending                     Ratio
               ================================================
               March 31, 2002                         2.00:1.00
               June 30, 2002                          2.00:1.00
               September 30, 2002                     2.00:1.00
               December 31, 2002                      2.00:1.00

               March 31, 2003                         1.85:1.00
               June 30, 2003                          1.80:1.00
               September 30, 2003                     1.80:1.00
               December 31, 2003                      2.00:1.00

               March 31, 2004                         2.15:1.00
               June 30, 2004                          2.15:1.00
               September 30, 2004                     2.30:1.00
               December 31, 2004                      2.30:1.00

               March 31, 2005                         2.60:1.00
               June 30, 2005                          2.60:1.00
               September 30, 2005                     2.60:1.00
               December 31, 2005                      2.60:1.00

               March 31, 2006                         2.90:1.00
               June 30, 2006                          2.90:1.00

               September 30, 2006                     2.90:1.00
               December 31, 2006                      2.90:1.00

               For each fiscal quarter thereafter     3.00:1.00
               ================================================
              "

               SECTION 2. The Waiver. (a) Subject to Section 3 hereof, the
Required Lenders hereby agree to waive for the period from the date hereof
through the date that is the earlier of (1) 125 days after the Amendment No. 4
and Waiver Effective Date and (2) the date on which the requisite holders of the
Senior Subordinated Notes exercise their right to give a notice of acceleration
pursuant to Section 6.02 of the Indenture under which the Senior Subordinated
Debt was issued (the "Waiver Termination Date"), (x) the requirements of Section
5.03(b) of the Credit Agreement for the Fiscal Years ended in 2002 and 2001 and
Section 5.03(c) of the Credit Agreement for the first three quarters of the
Fiscal Year ended in 2001 and 2002 and the first quarter of the Fiscal Year
ending in 2003, (y) any Defaults arising solely in connection with or in
consequence of the failure of the Borrowers to comply with the requirements of
Sections 5.03(b) and 5.03(c) for the periods set forth in the immediately
preceding clause (x) or any breach of the representations set forth in Section
4.01(g) or (h) of the Credit Agreement or any failure to deliver notice thereof
or any subsequent representation as to the absence thereof and (z) the Event of
Default described in clause (e) of Section 6.01 of the Credit Agreement arising
from a default under Section 4.03 of the Indenture under which the Senior
Subordinated Debt was

<PAGE>

                                       8

issued as a result of the Borrower's failure to meet the requirements of
Sections 5.03(b) and (c) for the periods set forth in the foregoing clause (x).
If the conditions of Section 2(b) below are not met on or prior to the Waiver
Termination Date, then, effective after the Waiver Termination Date, without any
further action by the Administrative Agent or the Lenders, all of the terms and
provisions set forth in the Loan Documents with respect to Defaults thereunder
that are waived hereunder and not cured prior to the Waiver Termination Date
shall have the same force and effect as if (i) this Amendment No. 4 and Waiver
had not been entered into by the parties hereto and (ii) any grace period
specified in Section 6.01 with respect to any such Defaults had expired, and the
Administrative Agent and the Lenders shall have all of the rights and remedies
afforded to them under the Loan Documents with respect to any such Defaults as
though no waiver had been granted by them hereunder. If the conditions of
Section 2(iii) below are met on or prior to the Waiver Termination Date, then,
effective concurrently therewith, without any further action by the
Administrative Agent or the Lenders, the waivers set forth in clauses (x), (y)
and (z) of the first sentence of this Section 2(b) shall become permanently
effective as fully as if no provision had ever been set forth in this Section
2(a) as to the termination of such waivers.

         (b) Prior to the Waiver Termination Date, the U.S. Borrower will
furnish to the Agents and the Lender Parties revised, audited annual financial
statements for the Fiscal Year ended in 2001 and audited annual financial
statements for the Fiscal Year ended in 2002, in each case as required by
Section 5.03(b) of the Credit Agreement.

         SECTION 3. Conditions of Effectiveness. This Amendment No. 4 and Waiver
shall become effective as of the first date (the "Amendment No. 4 and Waiver
Effective Date") on which each of the following conditions precedents shall have
been satisfied:

         (a) The Administrative Agent shall have received counterparts of this
     Amendment No. 4 and Waiver executed by the Borrowers, DEG Acquisitions,
     Dresser Holdings and the Required Lenders or, as to any of the Lenders,
     advice satisfactory to the Administrative Agent that such Lender has
     executed this Amendment No. 4 and Waiver.

         (b) All of the accrued fees and expenses of the Administrative Agent
     and the Lender Parties (including the accrued fees and expenses of counsel
     for the Administrative Agent) shall have been paid in full.

         (c) The Administrative Agent shall have received the consent attached
     hereto duly executed by each Guarantor and each Grantor.

         (d) The U.S. Borrower shall have paid to the Administrative Agent, for
     the benefit of the applicable Lenders, a fee equal to 0.125% of the
     aggregate Commitments of each Lender that has executed and delivered this
     Amendment No. 4 and Waiver on or before April 2, 2003.

         This Amendment No. 4 and Waiver is subject to the provisions of Section
9.01 of the Credit Agreement.

<PAGE>

                                       9

         SECTION 4. Representations and Warranties of the Borrower. Each
Borrower represents and warrants as follows:

         (a) On the date hereof, after giving effect to this Amendment No. 4 and
     Waiver, (i) no event has occurred and is continuing, or would result from
     the effectiveness of this Amendment No. 4 and Waiver, that constitutes a
     Default and (ii) all representations and warranties set forth in the Loan
     Documents shall be true and correct in all material respects.

         (b) No authorization or approval or other action by, and no notice to
     or filing with, any governmental authority or regulatory body or any other
     third party is required for the due execution, delivery or performance by
     the Borrowers of this Amendment No. 4 and Waiver and by the Guarantors and
     the Grantors of the consent attached hereto or other transactions
     contemplated hereby.

         (c) This Amendment No. 4 and Waiver has been duly executed and
     delivered by the Borrowers. The consent attached hereto has been duly
     executed and delivered by each of the Guarantors and the Grantors. This
     Amendment No. 4 and Waiver and each of the other Loan Documents, as amended
     hereby, to which each Borrower, each Guarantor and each Grantor is a party
     are legal, valid and binding obligations of such Borrower, such Guarantor
     and such Grantor, as applicable, enforceable against such Borrower, such
     Guarantor and such Grantor, as applicable, in accordance with their
     respective terms.

         SECTION 5. Reference to and Effect on the Credit Agreement and the
Notes. (a) On and after the effectiveness of this Amendment No. 4 and Waiver,
each reference in the Credit Agreement to "this Agreement", "hereunder",
"hereof" or words of like import referring to the Credit Agreement, and each
reference in the Notes and each of the other Loan Documents to "the Credit
Agreement", "thereunder", "thereof" or words of like import referring to the
Credit Agreement, shall mean and be a reference to the Credit Agreement, as
amended by this Amendment No. 4 and Waiver.

         (a) The Credit Agreement, the Notes and each of the other Loan
Documents, as specifically amended by this Amendment No. 4 and Waiver, are and
shall continue to be in full force and effect and are hereby in all respects
ratified and confirmed. Without limiting the generality of the foregoing, the
Collateral Documents and all of the Collateral described therein do and shall
continue to secure the payment of all Obligations of the Loan Parties under the
Loan Documents, in each case as amended by this Amendment No. 4 and Waiver.

         (b) The execution, delivery and effectiveness of this Amendment No. 4
and Waiver shall not, except as expressly provided herein, operate as a waiver
of any right, power or remedy of any Lender or the Administrative Agent under
any of the Loan Documents, nor constitute a waiver of any provision of any of
the Loan Documents.

         SECTION 6. Execution in Counterparts. This Amendment No. 4 and Waiver
may be executed in any number of counterparts and by different parties hereto in
separate counterparts, each of which when so executed shall be deemed to be an
original and all of which taken together shall constitute but one and the same
agreement. Delivery of an executed

<PAGE>

                                       10

counterpart of a signature page to this Amendment No. 4 and Waiver by telecopier
shall be effective as delivery of a manually executed counterpart of this
Amendment No. 4 and Waiver.

         SECTION 7. Governing Law. This Amendment No. 4 and Waiver shall be
governed by, and construed in accordance with, the laws of the State of New
York.

                      [SIGNATURE PAGES IMMEDIATELY FOLLOW]

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 4
and Waiver to be executed by their respective officers thereunto duly
authorized, as of the date first above written.

                                             DRESSER, INC., as U.S. Borrower

                                             By ________________________________
                                                Name:
                                                Title:

<PAGE>

                                      D.I. LUXEMBOURG S.A.R.L.,
                                      as Euro Borrower

                                      By _______________________________________
                                         Name:
                                         Title:

<PAGE>

                             DEG ACQUISITIONS, LLC

                             By:   FIRST RESERVE FUND VIII, L.P.,
                                   a Delaware limited partnership, its Manager
                               By:   FIRST RESERVE GP VIII, L.P.,
                                     a Delaware limited partnership, its general
                                     partner
                                By:   FIRST RESERVE CORPORATION,
                                      a Delaware corporation, its general
                                      partner

                                By: _________________________________
                                    Name:
                                    Title:

<PAGE>

                                           DRESSER HOLDINGS, INC.

                                           By __________________________________
                                              Name:
                                              Title:

<PAGE>

                                            MORGAN STANLEY SENIOR FUNDING, INC.,
                                            as Administrative Agent

                                            By _________________________________
                                               Name:
                                               Title:

<PAGE>

                                              MORGAN STANLEY & CO. INCORPORATED,
                                              as Collateral Agent

                                              By _______________________________
                                                 Name:
                                                 Title:

<PAGE>

                                              CREDIT SUISSE FIRST BOSTON,
                                              as Syndication Agent

                                              By _______________________________
                                                 Name:
                                                 Title:

                                              By _______________________________
                                                 Name:
                                                 Title:

<PAGE>

                                          GENERAL ELECTRIC CAPITAL
                                          CORPORATION, as Co-Documentation Agent

                                          By ___________________________________
                                             Name:
                                             Title:

<PAGE>

                                   REVOLVING CREDIT LENDERS, TRANCHE A EURO
                                   TERM LENDERS AND TRANCHE A U.S. TERM LENDERS

                                       _________________________________________
                                       [Print Name of Financial Institution]

                                       By ______________________________________
                                          Name:
                                          Title:

<PAGE>

                                  TRANCHE B TERM LENDERS

                                       _________________________________________
                                       [Print Name of Financial Institution]

                                       By ______________________________________
                                          Name:
                                          Title:

<PAGE>

                                        ISSUING BANKS

                                           WELLS FARGO BANK, N.A.

                                           By __________________________________
                                              Name:
                                              Title:

<PAGE>

                                           CREDIT SUISSE FIRST BOSTON

                                           By __________________________________
                                              Name:
                                              Title:

                                           By __________________________________
                                              Name:
                                              Title:

<PAGE>

                                        SWING LINE BANK

                                           WELLS FARGO BANK TEXAS, N.A.

                                           By __________________________________
                                              Name:
                                              Title:

<PAGE>

                                     CONSENT

                                                      Dated as of March 31, 2003

          Each of the undersigned as a Loan Party under the Credit Agreement
referred to in the foregoing Amendment No. 4 and Waiver and as Grantor under the
Security Agreement dated as of April 10, 2001 (as amended, supplemented or
otherwise modified from time to time, the "Security Agreement") in favor of the
Collateral Agent, for its benefit and the benefit of the Lenders party to the
Credit Agreement referred to in the foregoing Amendment No. 4 and Waiver, hereby
consents to such Amendment No. 4 and Waiver and hereby confirms and agrees that
(a) notwithstanding the effectiveness of such Amendment No. 4 and Waiver, each
Loan Document is, and shall continue to be, in full force and effect and is
hereby ratified and confirmed in all respects, except that, on and after the
effectiveness of such Amendment No. 4 and Waiver, each reference in each Loan
Document to the "Credit Agreement", "thereunder", "thereof" or words of like
import shall mean and be a reference to the Credit Agreement, as amended by such
Amendment No. 4 and Waiver, and (b) the Collateral Documents to which such
Grantor is a party and all of the Collateral described therein do, and shall
continue to, secure the payment of all of the Secured Obligations (in each case,
as defined therein).

                              DEG ACQUISITIONS, LLC

                              By:  FIRST RESERVE FUND VIII, L.P.,
                                   a Delaware limited partnership, its Manager
                               By:   FIRST RESERVE GP VIII, L.P.,
                                     a Delaware limited partnership, its general
                                     partner
                                By:    FIRST RESERVE CORPORATION,
                                       a Delaware corporation, its general
                                       partner

                                By:_________________________________
                                   Name:
                                   Title:

<PAGE>

                                           DRESSER HOLDINGS, INC.

                                           By __________________________________
                                              Name:
                                              Title:

                                           DRESSER INTERNATIONAL, INC.

                                           By __________________________________
                                              Name:
                                              Title:

                                           DRESSER RE, INC.

                                           By __________________________________
                                              Name:
                                              Title:

                                           DRESSER RUSSIA, INC.

                                           By __________________________________
                                              Name:
                                              Title:

                                           LVF HOLDING CORPORATION

                                           By __________________________________
                                              Name:
                                              Title:

                                           MODERN ACQUISITION, INC.

                                           By __________________________________
                                              Name:
                                              Title:

<PAGE>

                                    DRESSER ENTECH, INC.

                                    By _________________________________________
                                       Name:
                                       Title:

                                    RING-O VALVE, INCORPORATED

                                    By _________________________________________
                                       Name:
                                       Title:

<PAGE>

                                                                   SCHEDULE I TO
                                                      AMENDMENT NO. 4 AND WAIVER

<TABLE>
<CAPTION>
                                                  -----------------------------------------------
                                                                    Location
-------------------------------------------------------------------------------------------------
   Division            Description (Address)       Country      State        County      City

-------------------------------------------------------------------------------------------------
<S>                     <C>                           <C>    <C>              <C>       <C>
Flow Solutions   Bldg @ 85 Bodwell Street             US     Massachusetts    Norfolk     Avon
-------------------------------------------------------------------------------------------------
Flow Solutions   Building                             US       Louisiana      Rapides  Alexandria
-------------------------------------------------------------------------------------------------
  Instrument     200 Harrison Road Berea, KY          US        Kentucky      Madison     Berea
-------------------------------------------------------------------------------------------------
    Wayne        3814 Jarrett Way - Corridor Park     US         Texas        Travis     Austin
                 Facility
-------------------------------------------------------------------------------------------------

<CAPTION>
                ------------------------------------------
                 Net Book Value per
----------------
   Division       Original Schedule   Net Book Value as of
                       4.01 (v)        December 31, 2002
----------------------------------------------------------
<S>                            <C>               <C>
Flow Solutions                 4,637             1,760,050
----------------------------------------------------------
Flow Solutions             1,786,000             1,586,000
----------------------------------------------------------
  Instrument                                       594,685
----------------------------------------------------------
    Wayne                  2,017,477             1,784,881

----------------------------------------------------------
</TABLE><PAGE>

                                                                    EXHIBIT 4.10

                             AMENDMENT NO. 5 TO THE
                                CREDIT AGREEMENT

                                                      Dated as of June 30, 2003

   AMENDMENT NO. 5 TO THE CREDIT AGREEMENT among DRESSER, INC., a Delaware
corporation (the "U.S. Borrower"), and D.I. LUXEMBOURG S.A.R.L., a corporation
organized and existing under the laws of Luxembourg (the "Euro Borrower", and,
collectively with the U.S. Borrower, the "Borrowers"), DEG ACQUISITIONS, LLC, a
limited liability company organized and existing under the laws of Delaware
("DEG Acquisitions"), DRESSER HOLDINGS, INC., a Delaware corporation ("Dresser
Holdings"), the Subsidiary Guarantors party to the Credit Agreement referred to
below (the "Subsidiary Guarantors"), the banks, financial institutions and other
institutional lenders party to the Credit Agreement referred to below
(collectively, the "Lenders"), WELLS FARGO BANK TEXAS, N.A., as the swing line
bank, MORGAN STANLEY & CO. INCORPORATED, as collateral agent (the "Collateral
Agent"), MORGAN STANLEY SENIOR FUNDING, INC., as administrative agent (the
"Administrative Agent") for the Lenders and CREDIT SUISSE FIRST BOSTON, as
syndication agent (the "Syndication Agent", and together with the Collateral
Agent and the Administrative Agent, the "Agents").

   PRELIMINARY STATEMENTS:

   (1) The Borrowers, DEG Acquisitions, the Subsidiary Guarantors, the Lenders
and the Agents have entered into a Credit Agreement dated as of April 10, 2001,
as amended by Amendment No. 1 thereto dated as of March 13, 2002, Amendment No.
2 thereto dated as of June 17, 2002, Amendment No. 3 thereto dated as of
December 11, 2002 and Amendment No. 4 and Waiver thereto dated as of March 31,
2003 (such Credit Agreement, as amended, supplemented or otherwise modified
through the date hereof, the "Credit Agreement"). Dresser Holdings has entered
into an Assignment and Assumption Agreement dated as of July 3, 2002 with DEG
Acquisitions whereby Dresser Holdings assumed the duties and liabilities of DEG
Acquisitions under the Credit Agreement and the Security Agreement. Capitalized
terms not otherwise defined in this Amendment No. 5 have the same meanings as
specified in the Credit Agreement.

   (2) The Borrowers have requested that the Lenders amend certain provisions of
the Credit Agreement as provided herein.

   (3) The Lenders party hereto, constituting not less than the Required Lenders
are, on the terms and conditions stated below, willing to grant the request of
the Borrowers as hereinafter set forth.

   NOW, THEREFORE, for good and valuable consideration the sufficiency of which
is hereby acknowledged, and subject to the terms and conditions of this
Amendment No. 5, the parties agree as follows:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                        2

   SECTION 1. The Amendment. Subject to the satisfaction of the conditions
precedent set forth in Section 2, the definition of "EBITDA" in Section 1.01 of
the Credit Agreement is hereby amended and restated in its entirety as follows:

          ""EBITDA" means, in each case of the U.S. Borrower and each of its
       Subsidiaries, for any period, the sum (without duplication) of (a) Net
       Income, (b) to the extent Net Income has been reduced thereby, (i) all
       income taxes and foreign withholding taxes paid or accrued for such
       period, (ii) Interest Expense, (iii) Non-cash Charges less any non-cash
       items increasing Net Income for such period (other than normal accruals
       in the ordinary course of business), (iv) any cash charges resulting from
       the Transactions and the related financings that, in each case, are
       incurred prior to the six month anniversary of the Initial Extension of
       Credit, and (v) any non-capitalized transactions costs incurred in
       connection with actual, proposed or abandoned financings, acquisitions or
       divestitures, including, but not limited to, financing and refinancing
       fees and costs incurred in connection with the Transactions, all as
       determined in accordance with GAAP for such period, and (c) an allowance
       for losses (including lost earnings and incremental costs) incurred by
       the U.S. Borrower during the second and third fiscal quarters of the
       Fiscal Year ended December 31, 2003 attributable to a labor dispute at
       the Waukesha plant commencing on or about May 1, 2003, as reasonably
       determined in good faith by the U.S. Borrower, in an aggregate amount for
       all such losses under this clause (c) not to exceed $13,000,000, provided
       that, for purposes of the last fiscal quarter of Fiscal Year 2000 and the
       first fiscal quarter of Fiscal Year 2001, Consolidated EBITDA of the U.S.
       Borrower and its Subsidiaries shall mean, respectively U.S.$58,300,000
       and U.S.$54,900,000, provided, further that, for purposes of each of the
       second, third and fourth fiscal quarters of the Fiscal Year ended in
       2002, Consolidated EBITDA of the U.S. Borrower and its Subsidiaries shall
       mean, respectively, U.S.$47,700,000, U.S.$46,900,000 and
       U.S.$29,400,000."

   SECTION 2. Conditions of Effectiveness. This Amendment No. 5 shall become
effective as of the first date (the "Amendment No. 5 Effective Date") on which
each of the following conditions precedents shall have been satisfied:

      (a) The Administrative Agent shall have received counterparts of this
   Amendment No. 5 executed by the Borrowers, DEG Acquisitions, Dresser Holdings
   and the Required Lenders or, as to any of the Lenders, advice satisfactory to
   the Administrative Agent that such Lender has executed this Amendment No. 5.

      (b) All of the accrued fees and expenses of the Administrative Agent and
   the Lender Parties (including the accrued fees and expenses of counsel for
   the Administrative Agent) shall have been paid in full.

      (c) The Administrative Agent shall have received the consent attached
   hereto duly executed by each Guarantor and each Grantor.

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                        3

      (d) The U.S. Borrower shall have paid to the Administrative Agent, for the
   benefit of the applicable Lenders, a fee equal to 0.05% of the aggregate
   Commitments of each Lender that has executed and delivered this Amendment No.
   5 on or before July 11, 2003.

   This Amendment No. 5 is subject to the provisions of Section 9.01 of the
Credit Agreement.

   SECTION 3. Representations and Warranties of the Borrower. Each Borrower
represents and warrants as follows:

      (a) On the date hereof, after giving effect to this Amendment No. 5, (i)
   no event has occurred and is continuing, or would result from the
   effectiveness of this Amendment No. 5, that constitutes a Default and (ii)
   all representations and warranties set forth in the Loan Documents shall be
   true and correct in all material respects.

      (b) No authorization or approval or other action by, and no notice to or
   filing with, any governmental authority or regulatory body or any other third
   party is required for the due execution, delivery or performance by the
   Borrowers of this Amendment No. 5 and by the Guarantors and the Grantors of
   the consent attached hereto or other transactions contemplated hereby.

      (c) This Amendment No. 5 has been duly executed and delivered by the
   Borrowers. The consent attached hereto has been duly executed and delivered
   by each of the Guarantors and the Grantors. This Amendment No. 5 and each of
   the other Loan Documents, as amended hereby, to which each Borrower, each
   Guarantor and each Grantor is a party are legal, valid and binding
   obligations of such Borrower, such Guarantor and such Grantor, as applicable,
   enforceable against such Borrower, such Guarantor and such Grantor, as
   applicable, in accordance with their respective terms.

   SECTION 4. Reference to and Effect on the Credit Agreement and the Notes. (a)
On and after the effectiveness of this Amendment No. 5, each reference in the
Credit Agreement to "this Agreement", "hereunder", "hereof" or words of like
import referring to the Credit Agreement, and each reference in the Notes and
each of the other Loan Documents to "the Credit Agreement", "thereunder",
"thereof" or words of like import referring to the Credit Agreement, shall mean
and be a reference to the Credit Agreement, as amended by this Amendment No. 5.

   (b) The Credit Agreement, the Notes and each of the other Loan Documents, as
specifically amended by this Amendment No. 5, are and shall continue to be in
full force and effect and are hereby in all respects ratified and confirmed.
Without limiting the generality of the foregoing, the Collateral Documents and
all of the Collateral described therein do and shall continue to secure the
payment of all Obligations of the Loan Parties under the Loan Documents, in each
case as amended by this Amendment No. 5.

   (c) The execution, delivery and effectiveness of this Amendment No. 5 shall
not, except as expressly provided herein, operate as a waiver of any right,
power or remedy of

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                        4

any Lender or the Administrative Agent under any of the Loan Documents, nor
constitute a waiver of any provision of any of the Loan Documents.

   SECTION 5. Execution in Counterparts. This Amendment No. 5 may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute but one and the same agreement.
Delivery of an executed counterpart of a signature page to this Amendment No. 5
by telecopier shall be effective as delivery of a manually executed counterpart
of this Amendment No. 5.

   SECTION 6. Governing Law. This Amendment No. 5 shall be governed by, and
construed in accordance with, the laws of the State of New York.

                      [SIGNATURE PAGES IMMEDIATELY FOLLOW]

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

   IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 5 to be
executed by their respective officers thereunto duly authorized, as of the date
first above written.

                                             DRESSER, INC., as U.S. Borrower

                                             By ____________________________
                                                Name:
                                                Title:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                             D.I. LUXEMBOURG S.A.R.L., as Euro
                                             Borrower

                                             By ____________________________
                                                Name:
                                                Title:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                      DEG ACQUISITIONS, LLC

                                      By: FIRST RESERVE FUND VIII, L.P.,
                                          a Delaware limited partnership, its
                                            Manager
                                          By: FIRST RESERVE GP VIII, L.P.,
                                              a Delaware limited partnership,
                                              its general partner

                                              By: FIRST RESERVE CORPORATION,
                                                  a Delaware corporation, its
                                                  general partner

                                              By: ___________________________
                                                  Name:
                                                  Title:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                             DRESSER HOLDINGS, INC.

                                             By ____________________________
                                                Name:
                                                Title:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                             MORGAN STANLEY SENIOR FUNDING,
                                             INC., as Administrative Agent

                                             By ____________________________
                                                Name:
                                                Title:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                             MORGAN STANLEY & CO. INCORPORATED,
                                             as Collateral Agent

                                             By ____________________________
                                                Name:
                                                Title:

                             Amendment No. 5 to the
                            Dresser Credit Agreement

<PAGE>

                                          CREDIT SUISSE FIRST BOSTON
                                          as Syndication Agent

                                          By. __________________________________
                                              Name:
                                              Title:

                                          By. __________________________________
                                              Name:
                                              Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                          GENERAL ELECTRIC CAPITAL
                                          CORPORATION, as Co-Documentation Agent

                                          By. __________________________________
                                              Name:
                                              Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                        REVOLVING CREDIT LENDERS, TRANCHE A EURO
                        TERM LENDERS AND TRANCHE A U.S. TERM LENDERS

                                  ______________________________________________
                                  [Print Name of Financial Institution]

                                  By ___________________________________________
                                     Name:
                                     Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                             TRANCHE B TERM LENDERS

                                   _____________________________________________
                                   [Print Name of Financial Institution]

                                   By __________________________________________
                                      Name:
                                      Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                 ISSUING BANKS

                                          WELLS FARGO BANK TEXAS, N.A.

                                          By ___________________________________
                                             Name:
                                             Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                          CREDIT SUISSE FIRST BOSTON

                                          By ___________________________________
                                             Name:
                                             Title:

                                          By ___________________________________
                                             Name:
                                             Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                 SWING LINE BANK

                                          WELLS FARGO BANK TEXAS, N.A.

                                          By ___________________________________
                                             Name:
                                             Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                    CONSENT

                                                       Dated as of June 30, 2003

     Each of the undersigned as a Loan Party under the Credit Agreement referred
to in the foregoing Amendment No. 5 and as Grantor under the Security Agreement
dated as of April 10, 2001 (as amended, supplemented or otherwise modified from
time to time, the "Security Agreement") in favor of the Collateral Agent, for
its benefit and the benefit of the Lenders party to the Credit Agreement
referred to in the foregoing Amendment No. 5, hereby consents to such Amendment
No. 5 and hereby confirms and agrees that (a) notwithstanding the effectiveness
of such Amendment No. 5, each Loan Document is, and shall continue to be, in
full force and effect and is hereby ratified and confirmed in all respects,
except that, on and after the effectiveness of such Amendment No. 5, each
reference in each Loan Document to the "Credit Agreement", "thereunder",
"thereof" or words of like import shall mean and be a reference to the Credit
Agreement, as amended by such Amendment No. 5, and (b) the Collateral Documents
to which such Grantor is a party and all of the Collateral described therein do,
and shall continue to, secure the payment of all of the Secured Obligations (in
each case, as defined therein).

                                 DEG ACQUISITIONS, LLC

                                 By: FIRST RESERVE FUND VIII, L.P.,
                                     a Delaware limited partnership, its Manager
                                     By: FIRST RESERVE GP VIII, L.P.,
                                         a Delaware limited partnership,
                                         its general partner
                                         By: FIRST RESERVE CORPORATION,
                                             a Delaware corporation, its general
                                             partner

                                         By: ___________________________________
                                             Name:
                                             Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                          DRESSER HOLDINGS, INC.

                                          By ___________________________________
                                             Name:
                                             Title:

                                          DRESSER INTERNATIONAL, INC.

                                          By ___________________________________
                                             Name:
                                             Title:

                                          DRESSER RE, INC.

                                          By ___________________________________
                                             Name:
                                             Title:

                                          DRESSER RUSSIA, INC.

                                          By ___________________________________
                                             Name:
                                             Title:

                                          LVF HOLDING CORPORATION

                                          By ___________________________________
                                             Name:
                                             Title:

                                          MODERN ACQUISITION, INC.

                                          By ___________________________________
                                             Name:
                                             Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

<PAGE>

                                          DRESSER ENTECH, INC.

                                          By ___________________________________
                                             Name:
                                             Title:

                                          RING-O VALVE, INCORPORATED

                                          By ___________________________________
                                             Name:
                                             Title:

                            Amendment No. 5 to the
                           Dresser Credit Agreement

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