Exhibit 9.1

                                    AMENDMENT

                                     to the

                    HORNE FAMILY VOTING TRUST AGREEMENT 1991

      This Amendment to the HORNE FAMILY VOTING TRUST AGREEMENT - 1991 is made
as of the 25th day of October, 2001, by and among TIMOTHY P. HORNE, as Trustee
hereunder, WATTS INDUSTRIES, INC., a Deleware Corporation, and PETER W. HORNE,
Individually and as Trustee of the PETER W. HORNE TRUST - 1976.

                                    RECITALS

      1.    Timothy P. Horne currently serves as the sole Trustee of the Horne
            Family Voting Trust Agreement -- 1991, hereinafter referred to as
            the "Voting Trust".

      2.    Peter W. Horne is currently the sole Beneficiary, and the Peter W.
            Horne Trust -- 1976 the sole Stockholder of the Voting Trust.

      3.    The Peter W. Horne Trust -- 1976 is the registered owner of
            1,185,840 Voting Trust Certificates, issued by the Voting Trust,
            representing an equal number of shares of the Class B common stock
            of Watts Industries, Inc.

      4.    The subject Voting Trust will end on October 31, 2001 in accordance
            with the terms of the Trust Agreement.

      5.    In accordance with Section 13 of the subject Trust Agreement, the
            term of the Voting Trust may be extended for an additional term not
            exceeding ten years from the scheduled expiration date of the Voting
            Trust.

      6.    Peter W. Horne, individually and as the sole Trustee of the Peter W.
            Horne Trust -- 1976, desires to extend the term of the Voting Trust
            for a period of one year from the Voting Trust's scheduled
            expiration date.

      7.    Timothy P. Horne as Trustee hereunder has accepted the directive to
            extend the term of the Voting Trust for a period of one year.

      8.    Watts Industries, Inc. has acknowledged the directive and the
            Trustee's consent and the said Corporation hereby assents to the
            subject extension of the term of the Voting Trust.


                                   AMENDMENT

      In accordance with the provisions of Section 13 of the Voting Trust and
Section 218 of Delaware General Corporation Law, the term of the Voting Trust is
hereby extended for a one year period, and the Voting Trust shall continue in
accordance with the terms of the Agreement, until October 31, 2002.

      In all other respects, the terms of the subject Agreement are hereby
ratified and republished in their entirety as of the date first entered above.

      This Agreement may be executed in any number of counterparts with the same
effect as if all parties had signed the same document, and all counterparts
shall be construed together and shall constitute the same instrument.


 /s/ Timophy P. Horne                  /s/ Peter W. Horne
-------------------------------       ------------------------------
Timothy P. Horne, Trustee             Peter W. Horne,
as Aforesaid                          Individually


Watts Industries, Inc.

by: /s/ William C. McCartney           /s/ Peter W. Horne
--------------------------------      ------------------------------
Title: C.F.O                          Peter W. Horne
                                      Trustee of the Peter W. Horne Trust - 1997