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    dougpearce's Avatar
    dougpearce Posts: 1, Reputation: 1
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    #1

    Jun 27, 2012, 10:14 AM
    Plumbing knocking sound when we flush the toilet
    How can I fix a knocking sound in the plumbing when I flush the toilet
    Poppy76's Avatar
    Poppy76 Posts: 10, Reputation: 1
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    #2

    Jun 28, 2012, 02:02 AM
    You most likely need to change the cistern inlet valve. However it could also be the stop cock washer situated under the cistern. Failing the above must be loose pipe in wall. Can be other problems but these are the most common.
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