For low-pressure plumbing applications including air, water, natural gas, and steam. - Galvanized to resist rust and corrosion. Pipe Fitting Material / Galvanized Malleable Iron Fitting Schedule/Class / Class 150 Pipe Size - Pipe Fitting / 1 in x 1/4 in Fitting Connection Type / FNPT Standards / ASTM A197, FM Approved, Meets ASME B16.3, UL Listed Max. Pressure / 300 psi @ 150 Degrees F WOG Saturated Steam Pressure / 150 psi @ 350 Degrees F Temp. Range / -20 Degrees to 350 Degrees F