This 2?” Sch 80 CPVC True Union Diaphragm Valve, VITON, (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. 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. Petram PVC supply has a huge inventory of Sch 80 PVC and CPVC parts.