This 3″ Sch 80 CPVC Pneumatic Ball Valve, EPDM, Single Acting, (SOC x FNPT) 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. One side connects to a pipe using solvent welding and the other has female threads. 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.