Seriously, dead silence. I had a noise-cancelling check valve from home depot and decided to replace it with this one for two reasons. First, I have a Zoeller pump. If the quality of your check valve matches that of your pump, then it's worth every penny. Seriously, go to the builder's yard and get a sump pump and check it out. Then go to the plumbing store and look for Zoller. Its night and day. Second, the check valve from the home store was a 1 1/4" valve. So I had to reduce it from 1 1/2" to 1 1/4" and then back to 1 1/4", resulting in a flow restriction and the reduced the amount of water I was pumping out of my basement. And I have to pump out every gallon as fast as possible. There must be a natural spring or something under my house because my pump is running all the time. During a big storm it's so bad the float switch stays on for hours and the pump runs non stop. So as you can imagine I rely heavily on my sump system. Can't recommend it highly enough!
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