Document:

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                                                                    Exhibit 10.9
                              MOORE MEDICAL CORP.
                                 P.O. Box 1500
                             389 John Downey Drive
                           New Britain, CT 06050-1500

                         Change of Control Payment Plan

6.  Purpose

          The plan is designed to offer an incentive to selected key employees
          of the Company to continue in its employ by providing for severance
          payments if they should be affected as a result of a "change of
          control".

7.  Eligibility

          The participants in this plan are the key employees of the Company
          selected for participation by the President, as evidenced by her
          letter to the employee advising him or her of participation, and
          extent of participation, in the plan. Eligibility will terminate in
          the event of, and on, the material breach of his or her duties to the
          Company.

8.  Severance Payment Conditions

          Severance will be payable to participants only if the following
          condition is satisfied: (a) a "change of control" on or before
          December 31, 2000.*

          (c)  A "change of control" is:

               (iv) either (x) any merger or consolidation of the Company into
               or with another corporation (other than a subsidiary of the
               Company), or (y) the acquisition by another person or entity of
               beneficial ownership (as defined in Rule 13d-3 under the
               Securities Exchange Act of 1934) of more than 50% of the common
               stock of the Company unless, immediately after such merger,
               consolidation or acquisition, the holders of common stock of the
               Company immediately prior to such merger, consolidation or
               acquisition own more than 50% of the voting capital stock of such
               other corporation or the voting interests of such person or
               entity; or

               (v) any sale by the Company of substantially all of the assets
               and business of the Company for cash, stock, or any combination
               thereof, unless, immediately after such sale, the holders of
               common stock of the Company immediately prior to such sale own
               50% or more of the voting capital stock of the acquiring
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               corporation or, if the acquiring person or entity is not a
               corporation, more than 50% of the voting equity interests of such
               acquiring person or entity; or

          (vi) either (x) the election or removal of a majority of the
               directors of the Company as a result of a solicitation subject to
               Rule 14a-11 (or successor Rule) under the Securities Exchange Act
               of 1934 relating to the election or removal of directors, or (y)
               the election of directors constituting a majority of the
               directors of the Company by other than the action of directors a
               majority to whom consist of Continuing Directors; for purposes
               hereof, a "Continuing Director" means a director (aa) for whose
               election the Company solicited proxies pursuant to a proxy
               statement under Regulation 14A of said Act, or (bb) who was
               elected by action of the directors a majority of whom were
               elected as described in clause (aa) hereof, or (cc) who was
               elected by action of directors a majority of whom were elected as
               described in clause (aa) and/or clause (bb) hereof.

9.  Severance Amount

          Each participant's severance amount will be the amount stated in the
          President's letter referred to in paragraph 2, above, as a percentage
          of the participant's annualized W-2 gross salary plus employee 401(k)
          contribution, but will not include any amount computed with respect to
          any incentive or bonus compensation, Company 401(k) contribution, car
          allowance, or other Company provided benefit. (Should you accept, the
          letter refers to 75% of annualized W-2 gross salary). Payment of
          severance amounts will be made within 45 days after the quarter-end
          during which the later of the two conditions described in paragraph 3,
          above, occurs. In no event shall the amount payable under this
          paragraph exceed an amount which would (when aggregated with any other
          amounts which would be subject to the Section 280G or Section 162(m)
          provisions hereinafter referred to) result in any part of a payment
          otherwise to be made under this paragraph constituting a "parachute
          payment" under Section 280G of the Internal Revenue Code of 1986, as
          amended, or a payment which, pursuant to Section 162(m) of said Code,
          would not be deductible by the Company as compensation for federal
          income tax purposes.

10.  Administration:  Determinations

     The Board's Compensation Committee will administer the plan. All
     interpretations and implementations of the plan by the Committee not
     expressly inconsistent with the plan will be final and binding on the
     company and all participants. Neither this plan nor any letter or a
     participant under Section 2 thereof can be changed orally and can be
     changed only by writing specifically making a change and signed by the
     President of the Company.<PAGE>

                                                                   Exhibit 10.19

SIXTH AMENDMENT AGREEMENT
-------------------------

     SIXTH AMENDMENT AGREEMENT (This "Amendment Agreement") dated as of December
23, 1999 by and among Moore Medical Corp. (the "Borrower"), BankBoston, N.A. (as
successor by merger to Bank of Boston Connecticut) and certain other lending
institutions (collectively, the "Banks"), and BankBoston, N.A. (as successor by
merger to Bank of Boston Connecticut), as agent for the Banks (in such capacity,
the "Agent"), amending a certain Revolving Credit Agreement dated as of January
9, 1996, as amended by the First Amendment Agreement dated as of March 1, 1996,
the Second Amendment Agreement dated as of December 27, 1996, the Third
Amendment and Waiver Agreement dated as of April 14, 1997, the Fourth Amendment
and Waiver Agreement dated as of March 30, 1998 and the Fifth Amendment
Agreement dated as of April 30, 1998 (as amended, the "Credit Agreement").

WITNESSETH
----------

     WHEREAS, the Borrower has requested that the Banks amend certain terms and
conditions of the Credit Agreement; and

     WHEREAS, the Banks and the Agent are willing to amend such terms and
conditions on the terms and conditions set forth herein.

     NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

     (S)1.  Definitions. Capitalized terms used herein without definition that
            -----------
are defined in the Credit agreement shall have the same meanings herein as
therein.

     (S)2.  Ratification of Existing Agreements. All of the borrower's
            -----------------------------------
obligations and liabilities to the Agent and the Banks, and all the Agent's and
Banks' obligations and liabilities to the Borrower, as evidenced by or otherwise
arising under the Credit Agreement, the Notes and the other Loan Documents,
except as otherwise expressly modified in this Amendment Agreement upon the
terms set forth herein, are, by the Borrower's, the Agent's and Banks' execution
of this Amendment Agreement, ratified and confirmed in all respects. In
addition, by the Borrower's execution of this Amendment Agreement, the Borrower
represents and warrants that, subject to the provided and provided, however,
                                             --------     --------  -------
clauses of Section 5.4 of the Credit Agreement, no counterclaim, right of set-
off or defense of any kind exists or is outstanding with respect to such
obligations and liabilities.

     (S)3.  Representations and Warranties. All of the representations and
            ------------------------------
warranties made by the Borrower in the Credit Agreement, the Notes and the other
Loan Documents are true and correct on the date hereof as if made on and as of
the date hereof, except to the extent that any of such representations and
warranties relate by their terms to a prior date and except to the extent of
changes resulting from transactions contemplated or permitted by the Credit
Agreement and changes occurring in the ordinary course of business that singly
or in the aggregate do not have a Material Adverse Effect.

     (S)4.  Conditions Precedent. The effectiveness of the amendments
            --------------------
contemplated hereby shall be subject to the satisfaction on or before the date
hereof of each of the following conditions precedent:

            (a)  Representations and Warranties. All of the representations and
                 ------------------------------
     warranties made by the Borrower herein, whether directly or incorporated by
     reference, shall be true and correct on the date hereof, except as provided
     in (S)3 hereof.
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            (b)  Performance; No Event of Default. The Borrower shall have
                 --------------------------------
     performed and complied in all material respects with all terms and
     conditions herein required to be performed or complied with by it prior to
     or at the time hereof, and there shall exist no Default or Event of
     Default.

            (c)  Corporate Action. All requisite corporate action necessary for
                 ----------------
     the valid execution, delivery and performance by the Borrower of this
     Amendment Agreement and all other instruments and documents delivered by
     the Borrower in connection therewith shall have been duly and effectively
     taken.

            (d)  Delivery. The parties hereto shall have executed and delivered
                 --------
     this Amendment Agreement. In addition, the borrower shall have executed and
     delivered such instruments, and take such further action as the Agent and
     the Banks may have reasonably requested, in each case further to effect the
     purpose of this Amendment Agreement, the Credit Agreement and the other
     Loan Documents.

            (e)  Fees and Expenses. The Borrower shall have paid to the Agent
                 -----------------
     and the Banks all fees and expenses incurred by the agent in connection
     with this Amendment Agreement, the Credit Agreement or the other Loan
     Documents on or prior to the date hereof.

     (S)5.  Amendment to Credit Agreement.
            -----------------------------

            (S)5.1. Amendment to Revolving Credit Loan Maturity Date. The
                    ------------------------------------------------
     definition of "Revolving Credit Loan Maturity Date" appearing in Schedule 2
     to the Credit Agreement, and as amended by the Second Amendment Agreement,
     is hereby further amended by deleting the date "December 31, 1999"
     appearing therein and substituting therefor the date "March 30, 2000".

     (S)6.  Expenses. The Borrower agrees to pay to the Agent upon demand an
            --------
amount equal to any and all out-of-pocket costs or expenses (including
reasonable legal fees and disbursements and appraisal expenses) incurred or
sustained by the Agent in connection with the preparation of this Amendment
Agreement and any related matters.

     (S)7.  Miscellaneous.
            -------------

            (a)  This Amendment Agreement shall be governed by and construed in
     accordance with the laws of the State of Connecticut.

            (b)  Except as otherwise expressly provided by this Amendment
     Agreement, all of the respective terms, conditions and provisions of the
     Credit Agreement shall remain the same and in full force and effect. It is
     declared and agreed by each of the parties hereto that this Amendment
     Agreement and the Credit Agreement be read and construed as one instrument,
     and all references in the Loan Documents to the Credit Agreement shall
     hereafter refer to the Credit Agreement, as amended by this Amendment
     Agreement.
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     IN WITNESS WHEREOF, each of the parties hereto have caused this Amendment
Agreement to be executed in its name and behalf by its duly authorized officer
as of the date first written above.

                                    MOORE MEDICAL CORP.

                                    By:  /s/ Joseph P. Savidge
                                       -----------------------
                                       Title: Senior Vice President - Finance
                                              And Chief Financial Officer

                                    BANKBOSTON, N.A. (as successor by
                                    Merger to Bank of Boston Connecticut)
                                    Individually and as Agent

                                    By:  /s/ Donald W. Peters
                                       ----------------------
                                       Title: Vice President

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