Help identifying check valve

Feb 5, 2012
135
Cypress, TX
One of my check valves has a crack/leak in the cover. I am having a hard time finding the correct one to see if a replacement cover is available. Does anyone have one like this and do you know what the brand/model is? Thanks.

IMG_3513_zpsa7c46451.jpg
 
It only allows the water to flow in one direction. More to the point, it stops water from flowing backward from it's normal flow direction.

It's common pool/spa use is to keep the spa from draining back into the pool when the pump is off. There are other uses, but that's probably the most common.
 
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