Points: Practical Tools: Pool Check Valve 2 inches Installed at the water pump outlet. Prevent water flow back, and damage the pump impeller. It's a must-have accessory for swimming pools. Superb Materials: Check Valve Pool 2 Inch made with high-quality ABS and PVC material. High temperature and corrosion resistances. Support people's long-term use. Transparent Design: Check Valve For Pool. Transparent Design - Check valve for pool. The flow of liquid can be observed. Can clean the impurities blocked in the check valve. Practical working principle: Check valve for pool pump operates automatically and the disc opens under the pressure of a fluid flowing indirection. When the fluid flows in the opposite direction, the pressure of the fluid and the body weight of the disc work together to apply to the to cut off the flow. Installed: Swimming Pool Check Valve The water inlet/outlet is a 2-inch male/British universal interface. Just apply glue evenly when installing. Insert the outside of the PVC pipe into the inside of the check valve. Check valve for pool pump operates automatically and the disc opens under the pressure of a fluid flowing indirection. When the fluid flows in the opposite direction, the pressure of the fluid and the body weight of the disc work together to apply to the to cut off the flow. Specifications: Product name: Transparent visible check valve Product material: ABS+PVC Interface size: about 63MM/2.48in Product Use: Installed in the water pump outlet, prevent water flow back, and damage the pump impeller Color: Package Contents: 1 x Pool check valve 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.