My hot waster pipes make noise when the water is turned on. The noices is like a dull knocking sounds. I have a mixer tap.The pipe is hinden in the wall. Any help thanks

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Originally Posted by jay jay 587

My hot waster pipes make noise when the water is turned on. The noices is like a dull knocking sounds. I have a mixer tap.The pipe is hinden in the wall. Any help thanks

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A few more questions. Does the noise continue after the valve shuts off?
Is it a "bang" a "rattle" or a combination of both? Is your shower valve a one handled or a two knob valve? Regards, Tom