Thumping sink drain
Posted by Ted on April 16, 2003 at 10:05:32:

I've got an upstairs sink that thumps periodically when the upstairs air conditioning kicks on. I'm thinking there's pressure being created that's forcing some air back through the p-trap that's causing the thump. I can pull the sink drain almost closed and stop the thump. Any suggestion how I could fix this? Many thanks in advance!


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