Features: Accessory with valves 7235, 7236, 7305, 7511, and 7512, this 2 pack check valves cover set provide high performances solution to prevent leak and backflows in pool pump systems. The complete flapper assembly includes plastic covers, screws, and O rings designs to maintain water tight seal while resisting corrosion from pool chemicals. For pool maintenance technicians or homeowners need to repair aging check valves without replacing entire pump systems. Ensures proper water flows direction in residential and commercial pool filtrations systems, preventing drainage issues during pump shutdowns. Features pre lubricated O rings and easy installation process for quick replacement, restoring water circulation within minutes. Specifications: Materials: Plastic Size: Diameter 10.59cm/4.17inch Package Includes: 2pcs Pool Check Valves Covers note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.