This 1″ Sch 80 PVC True Union Diaphragm Valve, VITON, (SOC 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. One side connects to a pipe using solvent welding and the other has female threads. Sch 80 PVC is robust and durable, perfect for commercial and industrial applications. VITON seals provide increased temperature resistance than EPDM seals and recommended for exposure to oils, gasoline and aggressive chemicals. Petram PVC has all the schedule 80 PVC and CPVC fittings and valves you need for your project.