PumpSpy Silent Sump Pump Check Valve - 1-1/2 with Buna-N Couplings, Model CV-150, Spring-Loaded Flapper, Quiet Check Valve, Sump Pump Life Expectancy Increase, Includes Steel Clamps Fit 1-1/2″ Pipe

Works as advertised.

Annoying double Clunk noise after each time sump pump emptied was stopped with new quieter dump pump.

Now Im concerned whether my sump pump is working or not! I cant here the hammer sound anymore! My pump runs constantly end of winter/spring so Ill be really impressed if this lasts 2-3 years....

Quite I’ve done 3 different versions this is actually quite no hammering or loud noise. Easy install 30mins to do both my main and backup sump. Highly recommend this product. 2 year warranty on parts.

The spring on this required too much force to open. Too much back pressure on pump during start up. This would ruin a new pump faster than normal. Bad

My 35 years old well pump and plumbing has seen many component replacements. My most troublesome component has been the check-valve. Up until now I had used brass valves with spring loaded axial shutoffs and each one had a disappointing short useful life. This valve has a flapper shutoff which I truly believe will outlast all the others. Time will tell, of course, but this design is simple, old, and proven. The installation was a breeze and the buna-n rubber couplings did not leak one drop.

I was a bit skeptical about the word silent in the description BUT that is exactly what it is in operation. Not a bit of noise while it works. SUPER nice and reasonable cost. I hope it lasts for a long time.

Barely better than the previous valve that shut with a clunk that would wake the dead. This valve is actually quieter than the pump itself. Ready to install, works well.

We replaced both of our sumps and check valves but the valves we bought would make a loud banging sound when the pump shut off. We installed these and no more noise! Easy to install, Definitely worth buying!

I will recommend it. Exactly what I needed to stop the noise pump discharge!