I have this strange issue and would love some help. My plumbing system is filled with water and no leaks from any connectors and or faucets. However, when I turn on the faucet in the main bathroom, I hear what sounds like a dripping inside the wall downstairs. It only happens when the faucet is actually one. Also, I have no visible signs of any water anywhere. the pipes are PVC. I when to the basement to see if anyevidence of water but none. No bubbles in the wall or cieling. No water leak from any of the faucet fittings or the shut offs. Another thing is that it happens from whicher sink i use in that bathroom...it is a double sink. I would think that if it where the lines I would get the drip constantly.Oh by the way pipes are copper. And if it is a drain, I would think I would see evidence of it somewhere. Could this, or does this sound like it could be normal? If so, what is causing that sound and what can I do to stop it. Thanks in advance for the help
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dripping sound in wall when water is on