Master plumber, 1/2″ x 260″, yellow gas line pipe thread seal tape, for ferrous & non ferrous fittings in gas pipelines, cylinders & containers, suited for all threaded connections involving gas line installations for natural gas, propane, butane and/or water, oil & chemicals, withstands up to 10,000 psi & temperatures of -450&degree. Fahrenheit to 550&degree. Fahrenheit.