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                        AMENDMENT TO RIGHTS AGREEMENT

THIS AMENDMENT, made and entered into as of this 1st day of August, 1996, by
and between THE DURIRON COMPANY, INC. (the "Company") and KEYBANK NATIONAL
ASSOCIATION ("Key") is being executed under the following circumstances:

A.      The Company and Bank One, Dayton, N.A. ("Bank One") entered into a
        Rights Agreement dated August 1, 1986 ("Rights Agreement"), pursuant to
        which Bank One was appointed to act as a rights agent (the "Rights
        Agent") under the Rights Agreement. Bank One gave notice of its
        resignation as Rights Agent under the Rights Agreement in 1987 with the
        Company appointing an affiliate of Bank One as successor Rights Agent
        pursuant to Section 21 of the Rights Agreement. Effective October 1,
        1995 such affiliate of Bank One gave notice of its resignation of Rights
        Agent. The Company, in accordance with Section 21 of the Rights
        Agreement and in compliance with other provisions thereof, appointed
        Society National Bank ("Society") as successor Rights Agent effective
        October 1, 1995, and Society accepted the appointment of the position as
        successor Rights Agent effective on October 1, 1995. Effective June 17,
        1996, Key became the successor by merger to Society, and Key now serves
        as Rights Agent.

B.      NOW, THEREFORE, the Company and Key hereby amend the Rights Agreement as
        follows, pursuant to Section 26 of the Rights Agreement:

        1.      The second sentence of Section 4 of the Rights Agreement is
                amended by changing the figure "$30.00" to "$90.00".

        2.      Section 7(a) and Section 7(b) of the Rights Agreement are
                amended and restated to read as follows:

                        EXERCISE OF RIGHTS; PURCHASE PRICE; EXPIRATION DATE OF
                        RIGHTS.

                                (a)     The Rights shall become exercisable
                        following the close of business on the Distribution
                        Date. The Rights may be exercised to purchase Preferred
                        Stock, except as otherwise provided herein, in whole or
                        in part at any time after the Distribution Date upon
                        surrender of the Right Certificate, with the form of
                        election to purchase on the reverse side thereof duly
                        executed (with such signature duly guaranteed), to the
                        Rights Agent at the Securityholder Services Department
                        of the Rights Agent in Cleveland, Ohio, together with
                        payment of the Purchase Price with 
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                respect to each Right exercised, subject to adjustment as
                hereinafter provided, at or prior to the close of business on
                the earlier of (i) August 13, 2006 ("Final Expiration Date"), or
                (ii) the time at which the Rights are redeemed as provided in
                Section 23 hereof (such earlier date being herein referred to as
                the "Expiration Date").

                        (b)     The Purchase Price for each one one-hundredth
                (1/100) of a share of Preferred Stock issued pursuant to the
                exercise of a Right shall initially be $90.00. The Purchase
                Price and the number of shares of Preferred Stock or other
                securities to be acquired upon exercise of a Right shall be
                subject to adjustment from time to time as provided in Sections
                11 and 13 hereof. The Purchase Price shall be payable in lawful
                money of the United States of America, in accordance with
                paragraph (c) below.

3.      New Sections 7(e), 7(f) and 7(g) are added to the Rights Agreement and
        shall read as follows:

                        (e)     At any time after any Person becomes an
                Acquiring Person, a majority of the members of the Board of
                Directors who were in office at the time the Person became an
                Acquiring Person (with such members being called "Continuing
                Directors" hereafter) may, at their option, exchange all or part
                of the then outstanding and exercisable Rights (exclusive of any
                Rights that are or were at any time on or after the earlier of
                the Stock Acquisition Date or the Distribution Date acquired or
                beneficially owned by any Acquiring Person or any Associate or
                Affiliate of any such Acquiring Person, or any transferee of
                such Rights) (such excluded rights being hereinafter referred to
                as the "Excluded Rights") for shares of Common Stock at an
                exchange ratio of one share of Common Stock per Right,
                appropriately adjusted to reflect any stock split, stock
                dividend or similar transaction occurring after the Distribution
                Date (such exchange ratio being hereinafter referred to as the
                "Exchange Ratio").

                        (f)     Immediately upon the action of the Continuing
                Directors electing to exchange any Rights pursuant to Section
                7(e) and without any further action and without any notice, the
                right to exercise such Rights will terminate and thereafter the
                only right of a holder of such Rights shall be to receive that
                number of shares of Common Stock equal to the numbers of such
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                Rights held by such holder multiplied by the Exchange Ratio. The
                Company shall promptly thereafter give notice of such exchange
                to the Rights Agent and the holders of the Rights to be
                exchanged in the manner set forth in Section 24; provided that
                the failure to give, or any defect in, such notice shall not
                affect the validity of such exchange. Any notice which is mailed
                in the manner herein provided shall be deemed given, whether or
                not the holder receives the notice. Each such notice of exchange
                will state the method by which the exchange of shares of Common
                Stock for Rights will be effected and, in the event of any
                partial exchange, the number of Rights which will be exchanged.
                Any partial exchange shall be effected pro rata based on the
                number of Rights (other than Excluded Rights) held by each
                holder of Rights.

                        (g)     In any exchange pursuant to this Section 7, the
                Company, at its option, may substitute another security (having
                rights approximately equivalent to those then carried by a share
                of Common Stock, such other security being hereinafter referred
                to as a "Common Stock Equivalent") for shares of Common Stock
                exchangeable for Rights, at the rate of one Common Stock
                equivalent for each share of Common Stock, so that each Common
                Stock Equivalent delivered in lieu of each share of Common Stock
                shall have essentially the same dividend, liquidation and voting
                rights as one share of Common Stock then has.
        

4.      Exhibit B (Form of Right Certificate) is amended by changing the figure
        "$30.00" to "$90.00".

The remainder of the Plan shall remain unchanged, and the Plan, as so amended
above, shall remain in full force and effect.

IN WITNESS WHEREOF, the parties have duly executed this Amendment to the Rights
Agreement as of the day and year first above written.

THE DURIRON COMPANY, INC.               KEYBANK NATIONAL ASSOCIATION

By: Ronald F. Shuff                     By: Caroline Lukez-Byrne
Title: Vice President-                  Title: Assistant Vice President
       Secretary & General Counsel