This 3″ Sch 80 CPVC Butterfly Valve, VITON, (FLANGE x FLANGE) opens and closes to stop flow with a quarter turn of the handle. The disk inside the valve remains inside the flow path causing a larger pressure drop than copmarable ball valves. Butterfly valves are installed between a pair of flanges with falnge bolts. No gaskets are required, they are built into the valve face. 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. Our prices are a fraction of what you pay at your local plumbing store, order from Petram PVC Supply for quick shipping.