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Thank you John. I will try.

I hope I attached the pic. Here goes.

I don't know the faucet make. Sorry.

I have a single handle shower faucet that knocks when I call for shower only and only when in the middle, straight up position. There is not knock in the cold or hot only positions. This is one of two showers but the only one that knocks. The knock DOES stop if I turn on any water faucet...