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

    Jul 4, 2007, 11:34 PM
    Knocking sound in water line after flusing toilet
    What is the possible problem when you hear a knocking sound in the plumbing after flusing the toilet?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 4, 2007, 11:55 PM
    It is called water hammer. It usually happens when a valve (in your case a fill valve for the toilet) shuts off the flow of water quickly. You might try replacing the fill valve or add a water hammer air cushion.
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