This 3″ Sch 80 CPVC True Union Diaphragm Valve, EPDM, (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. EPDM seals provide effective sealing with resistances to several chemicals over a wide range of temperatures. Our prices are a fraction of what you pay at your local plumbing store, order from Petram PVC Supply for quick shipping.