Clear PVC is just as strong, rigid, and corrosion resistant as white PVC, but these fittings are transparent so you can see what"s flowing through your system. Compatible with standard-wall (Schedule 40) white PVC pipe and fittings, all are FDA compliant, UL 94V0 listed for flammability, and meet ASTM D2466 and D2464. NSF 61 certified for use with drinking (potable) water. Maximum Temperature: 140 Degrees F. Maximum Pressure: Not rated.