WOW! I saw it at an in-house exhibition and immediately ordered it from Amazon. I took the required measurements of the check valve, made the appropriate cuts in the drain pump PVC pipe, installed the valve and couldn't believe my ears when I reconnected the pump and heard nothing but water flowing into the valve. I don't know how long this product has been on the market, but it's quiet. When I think of the millions of people who deal with their sump pump's needless BACH who have no clue, there is a solution to the problem in less than 10 minutes! Let's hope those who write installation code books realize that a Zoeller check valve should be a must in every sump pump installation, and one day only our grandparents will remember that pop.
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