Check valve


New member
Which type is better


New member
I used to use #1 on a return pump I had. Because it was in constant use, the flap inside actually became permanently formed in the open position and would "bounce" open and closed when I turned the pump off; very annoying and ineffective. I've since plumbed my system to prevent any siphoning and don't use them any more. They can also greatly reduce your flow.

I've never used #2.


Grizzled & Cynical
I have used flapper style, Y style and ball style. All present friction head to the pump, so need to factor that into your pump choice. I found the flappers to be the worst of the three with a high propensity to stick, the Y style in the middle with the weighted plunger tending to get stuck up the passive arm (easiest to clean, though), and the ball style to work the best. Trouble is, none of them reliably seal completely so are essentially useless as a longer term backflow solution (i.e. protracted power outages).