This 3″ Sch 80 PVC True Union Diaphragm Valve, EPDM, (SOC x SOC) 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. Socket connections are joined to pipe of the same diameter with solvent welding. Sch 80 PVC is robust and durable, perfect for commercial and industrial applications. 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.