Rectorseal 8 oz. Tru-Blu Pipe Thread Sealant with PTFE. It is a fast dry, flexible set sealant designed for refrigeration and industrial applications. It enhances thread lubrication during assembly and break out and is recommended for use on threaded galvanized steel, iron, brass, copper, aluminum, stainless steel, polyethylene, fiberglass reinforced, PVC and CPVC pipe. It can also be used as a positive lock and seal on threaded fasteners. Conforms to TT-S-1732.