This 3″ Sch 80 PVC Pneumatic Ball Valve, EPDM, Single Acting, (SOC x SOC) is a true union ball valve with a pneumatic actuator on top for automatic control when compressed air is applied. the penumatic actuator opens when compressed air is applied to it but closes due to internal springs. 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.