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aces
May 1, 2009, 06:17 AM
Just replaced a sump pump in my basement. Everything works well,except: when the pump shuts down the pump makes a banging noise for about 30 seconds. I am using a check valve with the pump. Thanks. aces

speedball1
May 1, 2009, 06:36 AM
Noise is vibration. Feel around where the "thump" feels the strongest. My bet's on the check valve. Good luck, Tom