CPVC Y-check valve with threaded ends and (FKM) fluoroelastomer, size: 1-1/4-inch. The principal mechanical difference between CPVC and PVC is that CPVC is significantly more ductile, allowing greater flexure and crush resistance. CPVC is less apt to be corroded than PVC and also, under certain conditions, many types of metal pipe. Compared to Schedule 40, Schedule 80 pipes and fittings are thicker, hence they are better applied to jobs that require higher in-pipe pressure or higher water temperature. Backed by over 40 years of both product and process development experience, Spears has become one of the leading manufacturers of thermoplastic valves, fittings, and piping system components. Spears broad product line offers a complete selection of 1/8-inch through 12-inch injection molded fittings and fabricated fittings through 48-inch, many specialty products, and a full complement of manual and mechanically actuated thermoplastic valves in a variety of types, sizes, and configurations.