Fluoramics Formula-8 Pipe Joint Tube Thread Sealant PTFE Paste Oxygen Safe Use it for Natural Gas Applications, Welding Equipment, Gas Bottle Valves, Oxygen Distribution Oxygen-Compatible, Chemically Inert, Odor-Free Sealer Designed for use in Dry Conditions It is Especially Capable for Sealing Oxygen and Acetylene Cylinder Valves (We also Carry a Complete Line of Compressed Gas Cylinders Valves and Parts)