This 1½” Sch 80 CPVC True Union Ball Check Valve, VITON, (FNPT x FNPT) prevents flow from going in one direction using a ball inside the valve that seals with back pressure. a male adaptor, threaded pipe or pipe nipple connects to this part. CPVC is a higher temperature version of PVC and has better chemical resistances. VITON seals provide increased temperature resistance than EPDM seals and recommended for exposure to oils, gasoline and aggressive chemicals. Why pay more at your local store? Shop Petram PVC Supply for your best price.