CPVC is used of type 4, grade 1 compound as stated in ASTM D-1784. A complete line of fittings are stocked to meet your needs. This CPVC material has comparable corrosion resistance to PVC yet it is suitable for handling corrosive material at temps 40 to 60 deg F higher than PVC. It is NSF approved, but is not UV stabilized. The CPVC Van Stone fittings are socket plastic ring adjustable flanges.