Formula 8 PTFE Thread Sealant, 100 g. Oxygen-Compatible, Chemically Inert, Odor-Free Sealer Designed for use in Dry Conditions Use it for Natural Gas Applications, Welding Equipment, Gas Bottle Valves, Oxygen Distribution 3.5 oz Tube (100 grams) (We also Carry a Complete Line of Compressed Gas Cylinders Valves and Parts)