Document:

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Exhibit 4 (iii)

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                             AMERICAN STANDARD INC.

                        AMERICAN STANDARD COMPANIES INC.

                                       and

                            WILMINGTON TRUST COMPANY
               (successor to Manufacturers Hanover Trust Company)

                                   as Trustee

                          First Supplemental Indenture
                          Dated as of February 1, 2000

                                  $150,000,000

                     9 1/4% Sinking Fund Debentures Due 2016

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<PAGE>   2

            FIRST SUPPLEMENTAL INDENTURE, dated as of February 1, 2000, among
American Standard Companies Inc., a Delaware corporation (the "Guarantor"),
American Standard Inc., a Delaware corporation (the "Company"), and Wilmington
Trust Company, a Delaware banking corporation, as Trustee (the "Trustee").

                                    RECITALS

            WHEREAS, the Company and the Trustee are parties to that certain
Indenture, dated as of November 1, 1986 (the "Indenture"), pursuant to which the
Company has issued its 9 1/4% Sinking Fund Debentures due 2016 (the
"Securities"; capitalized terms used and not otherwise defined herein are used
with the meaning given such terms in the Indenture); and

            WHEREAS, the Guarantor is the owner of all of the outstanding
capital stock of the Company having the power to vote and wishes to guarantee
the due and punctual payment of the principal of, premium, if any, interest on
and sinking fund payments with respect to, the Securities and to substitute, for
the obligation of the Company, its own obligation to file with the Trustee all
information and reports required to be filed pursuant to Section 13 or 15 (d) of
the Securities Exchange Act of 1934; and

            WHEREAS, the Indenture provides that it may be supplemented without
the consent of the Holders of the Securities for such purposes, among others, as
are set forth in Paragraph (9) of Section 9.01 of the Indenture, and

            WHEREAS, the Guarantor, the Company and the Trustee have done all
things necessary under the Indenture to enter into this First Supplemental
Indenture, to make the guarantee herein the valid obligation of the Guarantor
and to make this First Supplemental Indenture a valid agreement among the
Guarantor, the Company and the Trustee in accordance with its terms.

            NOW, therefore, the parties hereto agree as follows:

                                    ARTICLE I

                                    Guarantee

            Section 1.01. The Guarantor hereby fully and unconditionally
guarantees to each Holder of a Security heretofore or hereafter authenticated
and delivered under the Indenture and to the Trustee on behalf of each such
Holder the due and punctual payment of the principal of, premium, if any, and
interest on such Securities (including, in the case of default, interest on
principal and, to the extent permitted by applicable law, on overdue interest
and including any additional interest required to be paid according to the terms
of such Securities), and the due and punctual payment of each sinking fund
payment provided for with respect to such Securities (the "Guarantor Debt"),
when and as the same shall become due and payable, whether at Stated Maturity or
by declaration of acceleration, call for redemption or otherwise, according to
the terms of such Security and of the Indenture. In case of the default by the
Company or any successor punctually to pay any such principal, premium,
interest, or sinking fund payment, the Guarantor hereby agrees to cause any such
payment to be made duly and punctually when and as the same shall be due, as if
such payment were made by the Company.

            The Guarantor hereby agrees that its Guarantor Debt hereunder shall
be as if it were principal debtor and not merely surety and shall be absolute
and unconditional, irrespective of the validity, regularity or enforceability of
any Security or this Indenture, the absence of any action to enforce the same,
any waiver or consent by the Holder of any Security with respect to any
provisions thereof or hereof, the recovery of any judgment against the Company
or any action to enforce the same, or any other circumstance which might
otherwise constitute a legal or equitable discharge or defense of a guarantor.
The Guarantor hereby waives diligence, presentment, demand of payment, filing of
claims with a court in

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the event of insolvency or bankruptcy of the Company, any right to require a
proceeding first against the Company, protest, notice and all demands whatsoever
and covenants that its guarantee hereunder will not be discharged except by
complete performance of its obligations contained in any such Security and in
this Guarantee.

            If the Trustee or the Holder of any Security is required by any
court or otherwise to return to the Company or the Guarantor, or any custodian,
receiver, liquidator, assignee, trustee, sequestrator or other similar official
acting in relation to the Company or the Guarantor, any amount paid to the
Trustee or such Holder in respect of a Security, this Guarantee, to the extent
theretofore discharged, shall be reinstated in full force and effect. The
Guarantor further agrees, to the fullest extent that it may lawfully do so,
that, as between the Guarantor, on the one hand, and the Holders and the
Trustee, on the other hand, the maturity of the obligations guaranteed hereby
may be accelerated as provided in Article V of the Indenture for the purposes of
this Guarantee, notwithstanding any stay, injunction or other prohibition except
as may arise under any applicable bankruptcy law preventing such acceleration in
respect of the obligations guaranteed hereby.

            The Guarantor shall be subrogated to all rights of the Holders of
the Securities against the Company in respect of any amounts paid by the
Guarantor on account of such Securities or this Indenture; provided, however,
that the Guarantor shall not be entitled to enforce or to receive any payments
arising out of, or based upon, such right of subrogation until the principal of,
premium, if any, and interest, if any, on all Securities shall have been
indefeasibly paid in full.

                                   ARTICLE II

                  Endorsement and Change of Form of Securities

            Section 2.01. Securities authenticated and delivered after the
execution of this First Supplemental Indenture may (unless the text of the
Security is modified as provided in Section 2.02) be stamped on the face or
reverse with a notation as follows:

            "American Standard Companies Inc., a Delaware corporation and owner
            of all of the issued and outstanding shares of capital stock of the
            issuer of this Security having voting power, has fully and
            unconditionally guaranteed the payment of the principal of, premium,
            if any, interest on and any sinking fund payment due with respect
            to, this Security (the "Guarantee"), the terms of which Guarantee
            are fully set forth in that certain First Supplemental Indenture
            dated as of February 1, 2000, a copy of which is available from the
            Trustee. For further information, write to either the Trustee or to
            American Standard Companies Inc., One Centennial Avenue, Piscataway,
            New Jersey 08854-6820, Attention:
            Treasurer."

            Section 2.02. In exchange for outstanding Securities, the Company
may issue new Securities that reflect the guarantee contained in this First
Supplemental Indenture.

                                   ARTICLE III

                                Periodic Reports

            Section 3.01. For so long as the Securities remain outstanding, the
Guarantor shall file with the Trustee within 15 days after the Guarantor is
required to file the same with the Securities and Exchange Commission copies of
the annual reports and of the information, documents and other reports (or
copies of such portions of any of the foregoing as said Commission may by rules
and regulations prescribe) which the Guarantor is required to file with said
Commission pursuant to Section 13 or Section 15 (d) of the Securities Exchange
Act of 1934; or, if the Guarantor is not required to file information, documents
or

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reports pursuant to either of such sections, then it shall file with the Trustee
and said Commission, in accordance with rules and regulations prescribed by said
Commission, such of the supplementary and periodic information, documents and
reports which may be required pursuant to Section 13 of the Securities Exchange
Act of 1934 in respect of a security listed and registered on a national
securities exchange as may be prescribed in such rules and regulations.

            Section 3.02. The Guarantor shall file with the Trustee and the
Securities and Exchange Commission, in accordance with rules and regulations
prescribed from time to time by said Commission, such additional information,
documents and reports with respect to compliance by the Guarantor with the
conditions and covenants provided for in the Indenture and this First
Supplemental Indenture, as may be required by such rules and regulations.

            Section 3.03. The Guarantor shall transmit to the Holders of the
Securities, as the names and addresses of such Holders appear on the registry
books of the Company, within 30 days after the filing thereof with the Trustee
such summaries of any information, documents and reports required to be filed by
the Guarantor pursuant to the provisions of Section 3.01 or 3.02 of this First
Supplemental Indenture as may be required by rules and regulations prescribed
from time to time by the Securities and Exchange Commission.

                                   ARTICLE IV

                                Events of Default

            Section 4.01. In addition to the Events of Default specified in the
Indenture, the following events shall be Events of Default with respect to the
Securities:

            (a) a default under any bond, debenture, note or other evidence of
            indebtedness for money borrowed by the Guarantor (including a
            default with respect to Securities (as defined in the Indenture) of
            any series other than that series) or under any mortgage, indenture
            or instrument under which there may be issued or by which there may
            be secured or evidenced any indebtedness for money borrowed by the
            Guarantor (including this Indenture), whether such indebtedness now
            exists or shall hereafter be created, which default shall have
            resulted in a principal amount of such indebtedness in excess of
            $10,000,000 becoming or being declared due and payable prior to the
            date on which it would otherwise have become due and payable,
            without such acceleration having been rescinded or annulled within a
            period of 10 days after there shall have been given, by registered
            or certified mail, to the Guarantor by the Trustee or to the
            Guarantor and the Trustee by the Holders of at least 25% in
            principal amount of the Outstanding Securities a written notice
            specifying such default and requiring the Guarantor to cause such
            acceleration to be rescinded or annulled and stating that such
            notice is a "Notice of Default" hereunder; provided, however, that,
            subject to the provisions of Sections 601 and 602 of the Indenture,
            the Trustee shall not be deemed to have knowledge of such default
            unless either (A) a Responsible Officer of the Trustee shall have
            actual knowledge of such default of (B) the Trustee shall have
            received written notice thereof from the Guarantor, from any Holder,
            from the holder of any such indebtedness or from the trustee under
            any such mortgage, indenture or other instrument;

            (b) the entry by a court having jurisdiction in the premises of (A)
            a decree or order for relief in respect of the Guarantor in an
            involuntary case or proceeding under any applicable Federal or State
            bankruptcy, insolvency, reorganization or other similar law or (B) a
            decree or order adjudging the Guarantor a bankrupt or insolvent, or
            approving as properly filed a petition seeking reorganization,
            arrangement, adjustment or composition of or in respect of the
            Guarantor under any applicable Federal or State law, or appointing a
            custodian, receiver, liquidator, assignee, trustee, sequestrator or
            other similar official of the Guarantor or of any substantial part
            of its

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            property, or ordering the winding up or liquidation of its affairs,
            and the continuance of any such decree or order for relief or any
            such other decree or order unstayed and in effect for a period of 60
            consecutive days; or

            (c) the commencement by the Guarantor of a voluntary case or
            proceeding under any applicable Federal or State bankruptcy,
            insolvency, reorganization or other similar law or of any other case
            or proceeding to be adjudicated a bankrupt or insolvent, or the
            consent by it to the entry of a decree or order for relief in
            respect of the Guarantor in an involuntary case or proceeding under
            any applicable Federal or State bankruptcy, insolvency,
            reorganization or other similar law or to the commencement of any
            bankruptcy or insolvency case or proceeding against it, or the
            filing by it of a petition or answer or consent seeking
            reorganization or relief under any applicable Federal or State law,
            or the consent by it to the filing of such petition or to the
            appointment of or taking possession by a custodian, receiver,
            liquidator, assignee, trustee, sequestrator or similar official of
            the Guarantor or of any substantial part of its property, or the
            making by it of an assignment for the benefit of creditors, or the
            admission by it in writing of its inability to pay its debts
            generally as they become due, or the taking of corporate action by
            the Guarantor in furtherance of any such action.

                                    ARTICLE V

                                  Miscellaneous

            Section 5.01. Except as hereby expressly modified, the Indenture and
the Securities issued thereunder and all the terms thereof, shall remain in full
force and effect.

            Section 5.02. This First Supplemental Indenture shall be executed in
one or more counterparts, each of which shall be deemed to be an original for
all purposes; but such counterparts shall together be deemed to constitute but
one and the same instrument.

            Section 5.03. Any notice to or demand on the Guarantor shall be made
in a writing delivered or mailed by first class mail, postage prepaid, to the
Guarantor at the following address:

                        American Standard Companies Inc.
                        One Centennial Avenue
                        Piscataway, New Jersey 08854-6820

The Guarantor by notice to the Trustee may furnish an alternative address.

            Section 5.04. The Trustee makes no representations as to the
validity or sufficiency of this First Supplemental Indenture, except as to the
due and valid execution hereof by the Trustee, and shall incur no liability or
responsibility whatsoever in respect of the validity hereof. The Trustee's
execution of this First Supplemental Indenture should not be construed to be an
approval or disapproval of the advisability of the amendments to the Indenture
provided herein.

            IN WITNESS WHEREOF, the parties hereto have caused this First
Supplemental Indenture to be

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duly executed, and their respective corporate seals hereunder to be affixed and
attested, all as of the day and year first above written.

                                   SIGNATURES

[Corporate Seal]                                AMERICAN STANDARD COMPANIES INC.

                                                By
                                                   ----------------------------
                                                   Vice President and Treasurer

Attest:

                                                By
----------------------------------                 ----------------------------
Assistant Secretary                                     Assistant Treasurer

                                                AMERICAN STANDARD INC.

[Corporate Seal]

                                                By
                                                   ----------------------------
                                                   Vice President and Treasurer

Attest:

-----------------------------------
Assistant Secretary

                                                WILMINGTON TRUST COMPANY
[Corporate Seal]
                                                            as Trustee

                                                By
                                                   ----------------------------
                                                            Vice President

Attest:

-----------------------------------
[Assistant Secretary]  [Trust Officer]<PAGE>   1
                                                                 EXHIBIT (4) (x)

================================================================================

                        AMERICAN STANDARD INC., as Issuer

                 AMERICAN STANDARD COMPANIES INC., as Guarantor

                                       and

                        THE BANK OF NEW YORK, as Trustee

                                 ---------------

                          Fourth Supplemental Indenture

                            Dated as of May 28, 1999

                                 ---------------

                               UP TO $200,000,000

                           8.25% Senior Notes due 2009

================================================================================

<PAGE>   2

              FOURTH SUPPLEMENTAL INDENTURE, dated as of May 28, 1999 (the
"Fourth Supplemental Indenture"), to the Indenture, dated as of January 15, 1998
(as amended, modified or supplemented from time to time in accordance therewith,
the "Indenture"), among AMERICAN STANDARD INC., a Delaware corporation
(hereinafter called the "Issuer"), having its principal office at One Centennial
Avenue, P.O. Box 6820, Piscataway, New Jersey 08835-6820, and AMERICAN STANDARD
COMPANIES INC., a Delaware corporation (hereinafter called the "Guarantor"),
having its principal office at One Centennial Avenue, P.O. Box 6820, Piscataway,
New Jersey 08835-6820, and THE BANK OF NEW YORK, a New York banking corporation,
as Trustee hereunder (hereafter called the "Trustee"), having its principal
office at 101 Barclay Street, Floor 21 West, New York, New York 10286.

                                    RECITALS

              WHEREAS, the Issuer, the Guarantor and the Trustee have each duly
authorized the execution and delivery of the Indenture to provide for the
issuance from time to time of one or more series of its senior debt securities
(the "Securities") to be issued in one or more series as in the Indenture
provided;

              WHEREAS, the Issuer and the Guarantor desire and have requested
the Trustee to join them in the execution and delivery of this Fourth
Supplemental Indenture in order to establish and provide for the issuance by the
Issuer and the Guarantor of a series of Securities designated as its 8.25%
Senior Notes due 2009 (the "Dollar Notes") in the aggregate principal amount not
to exceed $200,000,000, substantially in the form attached hereto as Exhibit A,
on the terms set forth herein;

              WHEREAS, Section 9.01 of the Indenture provides that a
supplemental indenture may be entered into by the Issuer and the Guarantor and
the Trustee for such purpose provided certain conditions are met;

              WHEREAS, the conditions set forth in the Indenture for the
execution and delivery of this Fourth Supplemental Indenture have been complied
with; and

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                                      -2-

              WHEREAS, all things necessary to make this First Supplemental
Indenture a valid agreement of the Issuer, the Guarantor and the Trustee, in
accordance with its terms, and a valid amendment of, and supplement to, the
Indenture have been done;

              NOW, THEREFORE:

              In consideration of the premises and the purchase and acceptance
of the Dollar Notes by the Holders thereof the Company mutually covenants and
agrees with the Trustee, for the equal and proportionate benefit of all Holders
of the Dollar Notes, that the Indenture is supplemented and amended, to the
extent and for the purposes expressed herein, as follows:

Section 1.    SCOPE OF THIS FOURTH
              SUPPLEMENTAL INDENTURE

              (a)    The changes, modifications and supplements to the Indenture
effected by this Fourth Supplemental Indenture in Section 2 hereof shall only be
applicable with respect to, and govern the terms of, the Dollar Notes issued by
the Issuer and the Guarantor, which shall not exceed an original aggregate
principal amount to $200,000,000, and shall not apply to any other Securities
which may be issued under the Indenture unless a supplemental indenture with
respect to such other Securities specifically incorporates such changes,
modifications.

              (b)    Pursuant to this Fourth Supplemental Indenture, there is
hereby created and designated a series of Securities under the Indenture
entitled "Dollar Notes due 2009." The Dollar Notes shall be in the form of
Exhibit A hereto. The Guarantee to be endorsed on the Dollar Notes shall be in
substantially the form set forth in exhibit B.

              (1)    the title of the Securities of such series shall be "Dollar
       8.25% Senior Notes due 2009" and the Dollar Notes are endorsed to the
       benefit of Article XII of the Indenture;

              (2)    the Dollar Notes shall be delivered from time to time in an
       aggregate principal amount not to exceed

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                                      -3-

       $200,000,000; provided that the aggregate principal amount of Dollar
       Notes initially authenticated on the Closing Dates shall not exceed
       $100,000,000;

              (3)    the Notes will be issued at a price of 98.864%;

              (4)    the principal of each Dollar Note shall be payable on June
       1, 2009;

              (5)    the Dollar Notes shall bear interest at the rate of 8.25%
       per annum;

              (6)    interest shall accrue on the Dollar Notes from May 28,
       1999, or the most recent date to which interest has been paid or duly
       provided for; the Interest Payment Dates for such Notes shall be June 1
       and December 1 in each year, commencing December 1, 1999, and the Regular
       Record Dates with respect to the Interest Payment Dates for such Notes
       shall be May 15 and November 15 in each year, respectively (whether or
       not a Business Day);

              (7)    the Corporate Trust Office of The Bank of New York, in New
       York, New York (and so long as the Notes are listed on the Luxembourg
       Stock Exchange and the rules of and the rules of such Exchange so
       require, in the city of Luxembourg and in any other city where such
       agency is required to be maintained under the rules of any stock exchange
       on which the Notes are listed) shall be the place at which (i) the
       principal of, premium, if any, and interest, if any, on the Dollar Notes
       shall be payable, (ii) registration of transfer of such Notes may be
       effected, (iii) exchanges of such Notes may be effected and (iv) notices
       and demands to or upon the Issuer in respect of such Notes and the
       Indenture may be served; and The Bank of New York shall be the Security
       Registrar for the Dollar Notes;

              (8)    the Dollar Notes shall not be redeemable by the Issuer
       prior to Maturity;

              (9)    not applicable;

<PAGE>   5
                                      -4-

              (10)   not applicable;

              (11)   not applicable;

              (12)   not applicable;

              (13)   not applicable;

              (14)   not applicable;

              (15)   see Section 2 of this Fourth Supplemental Indenture;

              (16)   not applicable;

              (17)   the Dollar Notes are to be issued as Registered Securities;
       each Dollar Note is to be initially registered in the name of Cede & Co.,
       as nominee for The Depository Trust Company (the "Depositary"). The
       Dollar Notes shall not be transferable or exchangeable, nor shall any
       purported transfer be registered, except as follows:

              (i)    a Dollar Note may be transferred in whole, and appropriate
                     registration of transfer effected, if such transfer is by
                     such nominee to the Depositary, or by the Depositary to
                     another nominee thereof, or by any nominee of the
                     Depositary to any other nominee thereof, or by the
                     Depositary or any nominee thereof to any successor
                     securities depositary or any nominee thereof; and

              (ii)   a Dollar Note may be exchanged for certificated notes
                     registered in the respective names of the beneficial
                     holders thereof, and thereafter shall be transferable
                     without restriction, if:

                            (A) The Depositary, or any successor securities
                     depositary, shall have notified the Issuer and the Trustee
                     that it is unwilling or unable to continue to act as
                     securities depositary with respect to such Dollar Note or
                     the Issuer becomes aware that the Depositary has ceased to
                     be a

<PAGE>   6
                                      -5-

                     clearing agency registered under the Securities Exchange
                     Act of 1934, as amended, and, in any such case, the Trustee
                     shall not have been notified by the Issuer within ninety
                     (90) days of the identity of a successor securities
                     depositary with respect to such Dollar Note;

                            (B) (1) an Event of Default shall have occurred and
                     be continuing under Section 5.02 of the Indenture and upon
                     the request of the holders of a majority of the Dollar
                     Notes; or

                            (C) at any time if the issuer in its sole discretion
                     determines that the Global notes (in whole but not in part)
                     should be exchanged for definitive registered notes.

              (18)   not applicable;

              (19)   not applicable;

              (20)   the Dollar Notes will be issued in book entry form;

              (21)   the Dollar Notes are subject to the defeasance and covenant
       defeasance provisions of the Indenture;

              (22)   not applicable;

              (23)   not applicable; and

       (24)   not applicable.

Section 2.    ADDITIONAL PROVISIONS

              (a) ADDITIONAL DEFINITIONS Each of the following definitions,
which constitute part of this Fourth Supplemental Indenture, shall be inserted
in proper alphabetical order in Article I of the Indenture. Any definition set
forth in the Indenture which is also set forth below shall have the meaning set
forth below for purposes of terms of the Indenture and this

<PAGE>   7
                                      -6-

Fourth Supplemental Indenture. Capitalized terms used in this Fourth
Supplemental Indenture but not defined herein shall have the meaning ascribed to
such terms in the Indenture.

              "Attributable Liens" means in connection with a sale and
lease-back transaction, the lesser of (a) the fair market value of the assets
subject to such transaction and (b) the present value (discounted at a rate per
annum equal to the average interest borne by all outstanding securities issued
under the Indenture (which may include securities in addition to the Dollar
Notes) determined on a weighted average basis and compounded semiannually) of
the obligations of the lessee for rental payments during the term of the related
lease.

              "Capital Lease" means any Indebtedness represented by a lease
obligation of a person incurred with respect to real property or equipment
acquired or leased by such person and used in its business that is required to
be recorded as a capital lease in accordance with GAAP.

              "Closing Date" means May 28, 1999.

              "Exempted Debt" means the sum of the following as of the date of
determination: (i) Indebtedness of the Issuer and Guarantor incurred after the
Closing Date and secured by Liens not otherwise permitted by the first sentence
under Limitation on Liens below (Section 10.11), and (ii) Attributable Liens of
the Issuer and Guarantor and their Subsidiaries in respect of sale and
lease-back transactions entered into after the Closing Date, other than sale and
lease-back transactions permitted by the limitation on sale and lease-back
transactions set forth under Section 10.12. For purposes of determining whether
or not a sale and lease-back transaction is "permitted" by Section 10.12,
Limitation on Sale and Lease-Back Transactions, the last paragraph under Section
10.11, Limitation on Liens (creating an exception for Exempted Debt), will be
disregarded.

              "Lien" means any lien, security interest, charge or encumbrance of
any kind (including any conditional sale or other title retention agreement, any
lease in the nature thereof, and any agreement to give any security interest).

<PAGE>   8
                                      -7-

              "Permitted Liens" means (i) Liens securing Indebtedness under the
Facility and any initial or subsequent renewal, extension, refinancing,
replacement or refunding thereof; (ii) Liens on accounts receivable, merchandise
inventory, equipment, and patents, trademarks, trade names and other
intangibles, securing Indebtedness; (iii) Liens on any asset of the Issuer and
Guarantor, any Subsidiary, or any joint venture to which the Issuer or the
Guarantor or any of their Subsidiaries is a party, created solely to secure
obligations incurred to finance the refurbishment, improvement or construction
of such asset, which obligations are incurred no later than 24 months after
completion of such refurbishment, improvement or construction, and all renewals,
extensions, refinancings, replacements or refundings of such obligations;
(iv)(a) Liens given to secure the payment of the purchase price incurred in
connection with the acquisition (including acquisition through merger or
consolidation) of property (including shares of stock), including Capital Lease
transactions in connection with any such acquisition, and (b) Liens existing on
property at the time of acquisition thereof or at the time of acquisition by the
Issuer or Guarantor or a Subsidiary or any person then owning such property
whether or not such existing Liens were given to secure the payment of the
purchase price of the property to which they attach; provided that, with respect
to clause (a), the Liens shall be given within 24 months after such acquisition
and shall attach solely to the property acquired or purchased and any
improvements then or thereafter placed thereon; (v) Liens in favor of customs
and revenue authorities arising as a matter of law to secure payment of customs
duties in connection with the importation of goods; (vi) Liens upon specific
items of inventory or other goods and proceeds of any person securing such
person's obligations in respect of bankers' acceptances issued or created for
the account of such person to facilitate the purchase, shipment or storage of
such inventory or other goods; (vii) Liens securing reimbursement obligations
with respect to letters of credit that encumber documents and other property
relating to such letters of credit and the products and proceeds thereof; (viii)
Liens on key-man life insurance policies granted to secure Indebtedness of the
Issuer or Guarantor against the cash surrender value thereof; (ix) Liens
encumbering customary initial deposits and margin deposits and

<PAGE>   9
                                      -8-

other Liens in the ordinary course of business, in each case securing
Indebtedness of the Company under interest swap obligations and currency
agreements and forward contract, option, futures contracts, futures options or
similar agreements or arrangements designed to protect the Issuer or the
Guarantor or any of their Subsidiaries from fluctuations in interest rates,
currencies or the price of commodities; (x) Liens arising out of conditional
sale, title retention, consignment or similar arrangements for the sale of goods
entered into by the Issuer or Guarantor or any of their Subsidiaries in the
ordinary course of business and (xi) Liens in favor of the Issuer or Guarantor
or any Subsidiary.

              (b) ADDITIONAL SECTIONS Each of the following provisions, which
constitutes part of this Fourth Supplemental Indenture, is numbered to conform
with the format of the Indenture:

Section 10.11  Limitation on Liens

              The Issuer and the Guarantor will not, and will not permit any of
their Subsidiaries to, create, incur, or permit to exist, any Lien on any of
their respective properties or assets, whether now owned or hereafter acquired,
or upon any income or profits therefrom, in order to secure any Indebtedness of
either of the Issuer or the Guarantor, without effectively providing that the
Dollar Notes shall be equally and ratably secured until such time as such
Indebtedness is no longer secured by such Lien, except: (i) Liens existing as of
the Closing Date; (ii) Liens granted after the Closing Date on any assets or
properties of the Issuer or the Guarantor or any of their Subsidiaries securing
Indebtedness of the Issuer or the Guarantor created in favor of the Holders of
the Dollar Notes; (iii) Liens securing Indebtedness of the Issuer or the
Guarantor which is incurred to extend, renew or refinance Indebtedness which is
secured by Liens permitted to be incurred under the Indenture; provided that
such Liens do not extend to or cover any property or assets of the Issuer or the
Guarantor or any of their Subsidiaries other than the property or assets
securing the Indebtedness being refinanced and that the principal amount of such
Indebtedness does not exceed the principal amount of the Indebtedness being
refinanced; (iv) Permitted

<PAGE>   10
                                      -9-

Liens; and (v) Liens created in substitution of or as replacements for any Liens
permitted by the preceding clauses (i) through (iv), provided that, based on a
good faith determination of an officer each of the Issuer and the Guarantor, the
property or asset encumbered under any such substitute or replacement Lien is
substantially similar in nature to the property or asset encumbered by the
otherwise permitted Lien which is being replaced.

              Notwithstanding the foregoing, the Issuer and the Guarantor and
any Subsidiary may, without securing the Dollar Notes, create, incur or permit
to exist Liens which would otherwise be subject to the restrictions set forth in
the preceding paragraph, if after giving effect thereto and at the time of
determination, Exempted Debt does not exceed the greater of (i) 10% of
Consolidated Net Assets or (ii) $250,000,000.

Section 10.12   Limitation on Sale and Lease-Back Transactions

              The Issuer and Guarantor will not, and will not permit any of
their Subsidiaries to, enter into any sale and lease-back transaction for the
sale and leasing back of any property or asset, whether now owned or hereafter
acquired, of the Issuer or Guarantor or any of their Subsidiaries (except such
transactions (i) entered into prior to the Closing Date or (ii) for the sale and
leasing back of any property or asset by a Subsidiary of the Issuer or Guarantor
to the Issuer or Guarantor or (iii) involving leases for less than three years
or (iv) in which the lease for the property or asset is entered into within 120
days after the later of the date of acquisition, completion of construction or
commencement or full operations of such property or asset) unless (a) the Issuer
or Guarantor or such Subsidiary would be entitled under the Limitation on Liens
covenant above to create, incur or permit to exist a Lien on the assets to be
leased in an amount at least equal to the Attributable Liens in respect of such
transaction without equally and ratably securing the Dollar Notes, or (b) the
proceeds of the sale of the assets to be leased are at least equal to their fair
market value and the proceeds are applied to the purchase or acquisition (or in
the case of real property, the construction) of assets or to the repayment of
Indebtedness of

<PAGE>   11
                                      -10-

the Issuer or Guarantor or a Subsidiary of the Issuer or Guarantor which by its
terms matures not earlier than one year after the date of such repayment.

<PAGE>   12
                                      -11-

              IN WITNESS WHEREOF, the parties hereto have caused this Fourth
Supplemental Indenture to be duly executed as of the day and year first above
written.

                                     AMERICAN STANDARD INC.

                                     By:
                                        ----------------------------------
                                        Name:
                                        Title:

                                     AMERICAN STANDARD COMPANIES INC.,
                                     as Guarantor

                                     By:
                                        ----------------------------------
                                        Name:
                                        Title:

                                     THE BANK OF NEW YORK, as Trustee

                                     By:
                                        ----------------------------------
                                        Name:
                                        Title:

<PAGE>   13

                                                                       EXHIBIT A

                               [Face of Security]

UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY ("DTC"), 55 WATER STREET, NEW YORK, NEW YORK TO THE
ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND SUCH
SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO., OR SUCH OTHER NAME AS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC, ANY TRANSFER, PLEDGE OR OTHER
USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL, SINCE THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

UNLESS AND UNTIL THIS SECURITY IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES
IN CERTIFICATED FORM, THIS SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY
DTC TO A NOMINEE THEREOF OR BY A NOMINEE THEREOF TO DTC OR ANOTHER NOMINEE OF
DTC OR BY DTC OR ANY SUCH NOMINEE TO A SUCCESSOR OF DTC OR A NOMINEE OF SUCH
SUCCESSOR.

                                      A-1
<PAGE>   14

                             AMERICAN STANDARD INC.
                           8.25% Senior Notes Due 2009

No. 01                                                             $100,000,000

                                                             CUSIP No. 029712AA4
                                                             ISIN US029712AA48

AMERICAN STANDARD INC., a Delaware corporation (herein referred to as the
"Issuer," which term includes any successor Person under the Indenture referred
to on the reverse hereof), for value received, hereby promises to pay to CEDE &
CO. or registered assigns the principal sum of ONE HUNDRED MILLION DOLLARS on
June 1, 2009 (the "Stated Maturity Date") and to pay interest thereon from May
28, 1999 or from the most recent Interest Payment Date to which interest has
been paid or duly provided for, semi-annually on June 1 and December 1 in each
year (each, an "Interest Payment Date"), commencing December 1, 1999, at the
rate of 8.25% per annum, until the principal hereof is paid or duly provided
for. The interest so payable, and punctually paid or duly provided for, on any
Interest Payment Date will, as provided in such Indenture, be paid to the Holder
in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date for such
interest, which shall be May 15 or November 15 (whether or not a Business Day),
as the case may be, next preceding such Interest Payment Date at the office or
agency of the Issuer maintained for such purpose; provided, however, that such
interest may be paid, at the Issuer's option, by mailing a check to such Holder
at its registered address or by transfer of funds to an account maintained by
such Holder within the United States. Any such interest not so punctually paid
or duly provided for shall forthwith cease to be payable to the Holder on such
Regular Record Date, and may be paid to the Holder in whose name this Security
(or one or more Predecessor Securities) is registered at the close of business
on a Special Record Date for the payment of such Defaulted Interest to be fixed
by the Trustee, notice whereof shall be given to Holders of Securities of this
series not less than 10 days prior to

                                      A-2
<PAGE>   15

such Special Record Date, or may be paid at any time in any other lawful manner
not inconsistent with the requirements of any securities exchange on which the
Securities of this series may be listed, and upon such notice as may be required
by such exchange, all as more fully provided in the Indenture. Interest will be
computed on the basis of a 360-day year of twelve 30-day months.

The principal of this Security payable on the Stated Maturity Date or the
principal of, premium, and interest on this Security will be paid against
presentation of this Security at the office or agency of the Issuer maintained
for that purpose in New York, in such coin or currency of the United States of
America as at the time of payment is legal tender for the payment of public and
private debts.

Interest payable on this Security on any Interest Payment Date and on the Stated
Maturity Date will include interest accrued from and including the next
preceding Interest Payment Date in respect of which interest has been paid or
duly provided for (or from and including May 28, 1999, if no interest has been
paid on this Security) to but excluding such Interest Payment Date or the Stated
Maturity Date, as the case may be. If any Interest Payment Date or the Stated
Maturity Date falls on a day that is not a Business Day, as defined below,
principal, premium, and/or interest payable with respect to such Interest
Payment Date or Stated Maturity Date, as the case may be, will be paid on the
next succeeding Business Day with the same force and effect as if it were paid
on the date such payment was due, and no interest shall accrue on the amount so
payable for the period from and after such Interest Payment Date or Stated
Maturity Date, as the case may be. "Business Day" means any day, other than a
Saturday or Sunday, on which banks in New York are not required or authorized by
law or executive order to close.

All payments of principal, premium, and interest in respect of this Security
will be made by the Issuer in immediately available funds.

Reference is hereby made to the further provisions of this Security set forth on
the reverse hereof, which further provi-

                                      A-3
<PAGE>   16

sions shall for all purposes have the same effect as if set forth at this place.

Unless the Certificate of Authentication hereon has been executed by the Trustee
by manual signature of one of its authorized signatories, this Security shall
not be entitled to any benefit under the Indenture, or be valid or obligatory
for any purpose.

                                      A-4
<PAGE>   17

IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly executed
under its facsimile corporate seal.

Dated:                                 AMERICAN STANDARD INC.
      -------------------

                                       By:
                                          --------------------------------
                                          Title:

Attest:

-----------------------------------
Assistant Secretary

TRUSTEE'S CERTIFICATE OF
AUTHENTICATION

Dated:
      -----------------------

THE BANK OF NEW YORK

as Trustee, certifies
that this is one of
the Securities referred
to in the Indenture.

by
  -----------------------------
   Authorized Signatory

                                      A-5
<PAGE>   18

                              [Reverse of Security]

                             AMERICAN STANDARD INC.

This Security is one of a duly authorized issue of securities of the Issuer
(herein called the "Securities"), issued and to be issued in one or more series
under an Indenture, dated as of May 28, 1999 (herein called the "Indenture")
among the Issuer, the Guarantor and The Bank of New York, as Trustee (herein
called the "Trustee," which term includes any successor trustee under the
Indenture with respect to the series of which this Security is a part), to which
Indenture and all indentures supplemental thereto reference is hereby made for a
statement of the respective rights, limitations of rights, duties and immunities
thereunder of the Issuer, the Trustee and the Holders of the Securities, and of
the terms upon which the Securities are, and are to be, authenticated and
delivered. This Security is one of the duly authorized series of Securities
designated on the face hereof (collectively, the "Securities"), and the
aggregate principal amount of the Securities to be issued under such series is
limited to $200,000,000 (except for Securities authenticated and delivered upon
transfer of, or in exchange for, or in lieu of other Securities). All terms used
in this Security which are defined in the Indenture shall have the meanings
assigned to them in the Indenture.

If an Event of Default, as defined in the Indenture, shall occur and be
continuing, the principal of the Securities of this series may be declared due
and payable in the manner and with the effect provided in the Indenture.

The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the Guarantor and the rights of the Holders of the Securities under
the Indenture at any time by the Issuer, the Guarantor and the Trustee with the
consent of the Holders of not less than a majority of the aggregate principal
amount of all Securities issued under the Indenture at the time Outstanding and
affected thereby. The Indenture also contains provisions permitting the Holders
of not less than a majority of the aggregate principal amount of the

                                      A-6
<PAGE>   19

Outstanding Securities, on behalf of the Holders of all such Securities, to
waive compliance by the Issuer and the Guarantor with certain provisions of the
Indenture. Furthermore, provisions in the Indenture permit the Holders of not
less than a majority of the aggregate principal amount, in certain instances, of
the Outstanding Securities of any series to waive, on behalf of all of the
Holders of Securities of such series, certain past defaults under the Indenture
and their consequences. Any such consent or waiver by the Holder of this
Security shall be conclusive and binding upon such Holder and upon all future
Holders of this Security and other Securities issued upon the registration of
transfer hereof or in exchange hereafter or in lieu hereof, whether or not
notation of such consent or waiver is made upon this Security.

No reference herein to the Indenture and no provision of this Security or of the
Indenture shall alter or impair the obligation of the Issuer, which is absolute
and unconditional, to pay the principal of (and premium) and interest on this
Security at the times, places and rate, and in the coin or currency, herein
prescribed.

As provided in the Indenture and subject to certain limitations therein and
herein set forth, the transfer of this Security is registrable in the Security
Register of the Issuer upon surrender of this Security for registration of
transfer at the office or agency of the Issuer in any place where the principal
of (and premium) and interest on this Security are payable, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Issuer and the Security Registrar duly executed by, the Holder hereof or by his
attorney duly authorized in writing, and thereupon one or more new Securities,
of authorized denominations and for the same aggregate principal amount, will be
issued to the designated transferee or transferees.

As provided in the Indenture and subject to certain limitations therein and
herein set forth, this Security is exchangeable for a like aggregate principal
amount of Securities of different authorized denominations but otherwise having
the same terms and conditions, as requested by the Holder hereof surrendering
the same.

                                      A-7
<PAGE>   20

The Securities of this series are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof.

No service charge shall be made for any such registration of transfer or
exchange, but the Issuer and the Guarantor may require payment of a sum
sufficient to cover any tax or other governmental charge payable in connection
therewith.

Prior to due presentment of this Security for registration of transfer, the
Issuer, the Guarantor, the Trustee and any agent of the Issuer or the Trustee
may treat the Person in whose name this Security is registered as the owner
hereof for all purposes, whether or not this Security be overdue, and neither
the Issuer, the Trustee nor any such agent shall be affected by notice to the
contrary.

No recourse shall be had for the payment of the principal of or premium, or the
interest on this Security, or for any claim based hereon, or otherwise in
respect hereof, or based on or in respect of the Indenture or any indenture
supplemental thereto, against any past, present or future stockholder, employee,
officer, director, incorporator, limited or general partner, as such, of the
Issuer or of any successor, either directly or through the Issuer or any
successor, whether by virtue of any constitution, statute or rule of law or by
the enforcement of any assessment or penalty or otherwise, all such liability
being, by the acceptance hereof and as part of the consideration for the issue
hereof, expressly waived and released.

The Indenture and the Securities shall be governed by and construed in
accordance with the laws of the State of New York applicable to agreements made
and to be performed entirely in such State without regard to conflicts of law
principles thereof.

                                      A-8
<PAGE>   21

ASSIGNMENT FORM

               To assign this Securities, fill in the form below:

               I or we assign and transfer this Security to

            ----------------------------------------------------------

            ----------------------------------------------------------

            ----------------------------------------------------------

            (Print or type assignee's name, address and zip code)

            ----------------------------------------------------------

            (Insert assignee's soc. sec. or tax I.D. No.)

            and irrevocably appoint                           agent to transfer
            this Security on the books of the Company.  The agent may substitute
            another to act for him.

-------------------------------------------------------------------------------

Date:                      Your Signature:
      --------------------                 --------------------

Signature Guarantee:
                     ----------------------------------

                       (Signature must be guaranteed)

---------------------------------------------------------------

Sign exactly as your name appears on the other side of this Security.

                                      A-9
<PAGE>   22

                                                                       EXHIBIT B

                          FORM OF NOTATION ON SECURITY
                  RELATING TO AMERICAN STANDARD COMPANIES INC.

              The Guarantor has unconditionally guaranteed, to the extent set
forth in the Indenture and subject to the provisions in the Indenture, the due
and punctual payment and performance of the obligations of the Issuer in
connection with the Indenture and each Series of Securities issued thereunder.
In case of the failure of the Issuer punctually to perform or make any such
payment, the Guarantor hereby agrees to cause such payment and performance to be
made punctually.

              The obligations of the Guarantor to the Holders and to the Trustee
pursuant to the Guarantee and the Indenture are expressly set forth in Article
Twelve of the Indenture and reference is hereby made to the Indenture for the
precise terms of the Guarantee. Capitalized terms used and not defined herein
have the meanings ascribed thereto in the Indenture.

AMERICAN STANDARD COMPANIES INC.

By:
   -------------------------------
   Name:
        --------------------------
   Title:
         -------------------------

Attest:

By:
   -------------------------------
   Name:
        --------------------------
         [Assistant] Secretary

(Seal)

                                      B-1

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