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Discuss knocking in bathroom drain in the Water Underfloor Heating Advice area at PlumbersForums.net

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Tom in Texas

This morning I heard knocking coming from my bathroom sink drain! The central heat outdoor unit is just outside the wall, and it was running. I went outside, but it seemed fine. When the heat unit went off, the knocking stopped. What the hey? I have a video, but I didn't see a way to add it to this. --Tom in Texas
 

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