Richard Mc Burney
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I just installed a 2' verticle check valve between my pool solar pump and the solar pannels on the roof. I need the check valve because I'm installing an additional pump for a water fall into the pool. When I shut the solar pump off the water draining back from the roof starts the 2" pipe to the roof and the check valve thumping which last for about 2 minutes and can be heard clearly in the house. Any suggestions how to get rid of this thumping? How about a releif valve? or possibly a horozontal spring check valve??