Customer Reviews for Sentinel Drain Guard Sewage Backflow Preventer 3 in. and 4 in. Backwater Valve - Holmes Approved

Starting every spring our entire street has backflow issues. We installed one of these this year and for the first year had no issues.

Easy install, muffles the water draining noise also.

Drain hole needs to be cleaned perfectly for this to fit. If the drian hole inside the concrete floor was squished youll need to grind hole to fit this. The plastic is super hard on this piece. Cant tell if it works till a backup comes. However the float ball moves easily and cage is solid. seals look good.

Had water coming up from basement drain for no reason in the middle of the night. Tried this to see if it would help. The Mike Holmes approved label made me think this had been well tested. However I am guessing they paid for his stamp of approval without really getting it. If the water comes up slowly there isn’t enough force to push the ball inside up to block the hole. As a result with slow rising water this didn’t do anything to help. Waste of money.

Great concept. Didn't fit quite right in my drain pipe, but should do the trick.