Item Type: Check ValveMaterial: ABS, PVCSize: Approx. 16.5 x 11cm / 6.5 x 4.3inWeight: Approx. 439g / 15.5ozCaliber Specification: G1-1/2 (1.5inches)Use Place: Swimming Pool, Spa.Application Scope: It Can Be Used to Install the Water Supply and Drainage Pipes of Swimming Pools and Spas with Acidic or Alkaline Fluids at a Temperature of 5~50. the Check Valve Relies on the Liquidflow of the Liquid Itself to Automatically Open or Close the Sealing Baffle, Thereby Forming a Directional Liquidflow State of the Liquid.It is Mainly Suitable for the Water Outlet Pipe of the Machine Room Water Pump Installed in the Swimming Pool and Spa Pool, the Pipe from the Water Pump of the Integrated Filtering Equipment to the Filtering Equipment, the Automatic Drainage Pipe of the Filtering Equipment, Etc.The Main Function:A. Prevent Unpredictable Damage to the Pump Due to the Backflow of LiquidB. Prevent the Filter Equipment from Being Polluted Again Due to the Backflow of Liquid