Rectorseal #5, 1/2 Pint Pipe Thread Sealant, Soft Set, Slow Drying, Can Be Pressurized Immediately Fpr Piping Up To 2" Diameter & 100 PSI, Recommended For Use On Threaded Galvanized Steel, Iron, Brass, Copper, Aluminum, Stainless Steel, Polyethylene, Fiberglass Reinforced & PVC Pipe, NSF, UL & AGA Certified.