Design 7235 180-DGREE 1-1/2" to 2" check valve is suitable for most swimming pool pumps 1-1/2" & 2" PVC pipe. Designed with a chemical resistant super alloy spring for use with salt chlorinators and chemical dosing systems. Function The 7235 180-DGREE 1-1/2 inch to 2 inch check valve can handle flow rates up to 170 gpm with minimal head loss, making it ideal for spas and water features requiring high flow rates. The diverted in the 7235 180-DGREE 1-1/2 inch to 2 inch check valve swings open completely to allow for minimal back pressure and no water turbulence. Features .