Master Plumber, OZ, Yellow Formula 55 Thread Seal, Yellow Pipe Thread Compound For Lines Carrying LP & Natural Gas, Use On All Metals, Plastic PVC, CPVC, ABS & Nylon, Tolerates - 50 Degrees Fahrenheit To + 400 Degrees Fahrenheit, Gas To 3,000 PSI, Liquid To 6,000 PSI, Slow Drying, Never Seizes, Do Not Use On Oxygen Lines, Allows Easy Disassembly, UPC Listed, Tube.