Spears 2022-007C CPVC Schedule 80 Products CPVC Gate Valves CPVC gate valves, socket ends; EPDM elastomer Sizing: 3/4-inch Schedule 80 CPVCs: not for Compressed Air or Gas; do not use compressed air or gas even to test, or clear, any PVC or CPVC piping system CPVC piping is suitable for hot water distribution as high as 180 Fahrenheit; PVC piping is ideal for use with temperatures up to 140 Fahrenheit Sch 80 and Sch 40 have different inside/outside diameters for each unit size; the same is true with CPVC versus PVC; adapters allow interconnectivity