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

Tired of the cheap builder grade hammering loud check valve and bought this gem. Wish I knew this company was local and I would stop by and just bought it. Excellent valve and 100% quiet

We had the worst banging on our sump pump pipes and just like that they are gone the minute I installed this check valve. Amazing!

Does not make thumping sound, clean and gives you confidence thats working. Easy to install. Highly recommend it.

Works in horizontal position. Can watch flow. No noise as others have reported. In cabinet under sink with a tank/pump system as no other way to drain sink by gravity

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

Very quiet sump pump! Nice and easy installation too! Remove old one, drain water from pipe, and slide new one into place and tighten. Im not super handy, but anyone can do this. Just make sure you have a 5 gallon bucket and towels handy. Remove the bottom of the old one first then remove the top. Easier to control the water drainage.

This thing works fantastic works really well better than a water hammer arrestor makes no noise at all

Solved the banging in my PVC pipes. Super quiet now and I like that I could see the fluid in the valve. Highly recommend. And I like that you can install it horizontally.

This was easy to install, just slip over the 1-1/2 discharge pipe. My old check valve was chattering when the pump shut off. This valve closes quietly and does not chatter. My pump is quiet now. Problem solved easily and for a reasonable cost. I would buy this again.

I replaced my aging sump pump and the new one was apparently strong enough to cause some sleep-robbing noise from the existing check valve. I added another cheap check valve hoping that would relieve it. It helped but was still noisy. I replaced both with these PumpSpy check valves in and the noise is gone. Hallelujah!