Pipe Thread Sealant: Rectorseal #21 Black, 1/2 Pint.

Can Be Used on Galvanized Steel, Iron, Brass, Copper, Aluminum, Stainless, Polyethylene, Fiberglass & PVC.

#5 and #21 Multi-Purpose Lead-Free Sealants. Soft-set, slow drying compounds which seal, lubricate and protect threaded pipe and fittings. Can be used on galvanized steel, iron, brass, copper, aluminum, stainless, polyethylene, fiberglass and PVC. (Not for ABS or CPVC). Rated to 12,000 PSI liquids and 2,600 PSI gas. Brushable from +20° to +140° F.

Both products can be used with diluted acids, ammonia, diesel fuel, gasoline, 10% gasohol, hydraulic oils, jet fuel, kerosene, LP gas, nitrogen gas, petroleum solvents, compressed air and hot or cold water.

Both products are available in 1/2 pint or 1 pint cans with brush top lids. #5 is an off-yellow color and #21 is black.