Features Galvanized to resist rust and corrosion. Pipe Fitting Material / Galvanized Malleable Iron Fitting Schedule/Class / Class 150 Pipe Size - Pipe Fitting / 3 in x 1 in Fitting Connection Type / FNPT Standards / ASTM A-197, ASTM A47, ASME B16.3 and B16.4, UL Listed, FM Approved, NSF-61 and AB1953 Listed Max. Pressure / 300 psi @ 150 Degrees F WOG Saturated Steam Pressure / 150 psi