Simplify your next Sure-Weld TPO installation with Carlisle TPO T-Joint Covers. Sure-Weld TPO T-Joint Covers are used to seal step-offs at splice intersections. Installation is mandatory on all 60- and 80-mil TPO systems and on 45-mil systems where step-offs have not been properly sealed. Sure-Weld TPO T-Joint Covers consist of 60-mil non-reinforced TPO formed into a perfect 4.5″-diameter circle and packaged 100 parts per carton. If you do not see what you are looking for, feel free to call us at 1 (800) 267-2308 and ask for an E-Commerce Representative.