These are hi-temp CPVC schedule 80 socket pipe fittings. 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° F higher than PVC. It is NSF listed, but is not UV stabilized.