This Grainger Approved elbow features thicker walls that can withstand higher pressures than class 150 fittings. - Model is suitable for air, water, oil, natural gas, and steam. Pipe Fitting Material / Malleable Iron Finish/Coating / Galvanized Class / Class 300 Fitting Side A Type / NPT Fitting Side B Gender / Female Fitting Side B Type / NPT Standards / ASME B16.3, ASTM A197, ASTM A47, FM Approved, UL Listed