Master Plumber, OZ, Yellow Formula 55 Thread Seal, Yellow Pipe Thread Compound For Lines Carrying LP, Natural Gas & Oxygen, Use On All Metals, Plastic PVC, CPVC, ABS & Nylon, Tolerates -50&degree. Fahrenheit To +400&degree. Fahrenheit, Gas To 3000 PSI, Liquid To 6000 PSI, Slow Drying, Never Seizes, Allows Easy Disassembly, UPC Listed, Tube.