Fitment: Replacement for 7235,7236,7305,7511,7512 Check Valve Function: This baffle valve allows water to flow into the underground swimming pool, but prevents water from flowing backwards. The transparent cover can see the flow of water. Material: The spring and pin are mainly made of stainless steel with tension, and the baffle is made of plastic, which is firm and not easy to crack; The O-ring is made of rubber, , sealing and not easy to leak. Include: 7451 Flapper,7302 Spring,7304 Pin,7236 Cover and 1132 Cover o-Ring (Already assembled) Quantity:2 Set Colour:As Shown Material:Plastic Package Contents: 2 * 7056 Check Valve Cover kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.