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    peadys's Avatar
    peadys Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 29, 2012, 10:31 AM
    Knocking after toilet flushes( when float shuts off
    Every time I flush a particular toilet , after the chamber refills and the float valve stops, there is a knocking in the wall behind the toilet. Other toilet and valves do not cause knocking. I have an old valve (40yrs) in place ; not a ball valve on a lever, but a vertical valve with a plastic red top. Whenever I push down slightly on the shut-off valve, the knocking occurs. Can this be fixed by replacing the valve or should I replace the entire flush mechanism?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Aug 29, 2012, 11:14 AM
    I would replace the valve first, Good luck, Tom
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