Polypropylene ball valve , stainless steel bolts, fiberglass reinforced material for added strength, self aligning ball moves freely against PTFE seats for smooth operation, valve opens and closes with very little pressure on the hanle. Ball is diamond turned after molding to make it spherically perfect, which provides precise contact between ball and seats. FKM O-rings and PTFE self lubricating stem bushings and seats cannot stick or bind