This 3″ Sch 80 CPVC True Union Diaphragm Valve, VITON, (FNPT x FNPT) is a true union diaphragm valve restrics flow through it as the handel is turned. The clear section on top allows you to see the valve position. 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. Our prices are a fraction of what you pay at your local plumbing store, order from Petram PVC Supply for quick shipping.