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

    May 20, 2015, 07:12 PM
    Rapid knocking sound inside wall after flushing
    Hi,

    After we flush the toilet, as the bowl is close to filling up, there is a repeated tapping/knocking sound in the wall that continues for 5-6 seconds until it tapers off -- it also becomes more rapid and softer as it goes away.

    Any idea what it is?

    Thanks!
    Claire
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    May 20, 2015, 07:34 PM
    Bad fill valve washer. You could try to repair it but for $14 you can simply install a top of the line Fluidmaster 400 A Fluidmaster 15543143 N/A - Build.com
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