Features 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 / Zinc Plated Class / Class 300 Fitting Side A Nominal Pipe Size / 1/4 in Fitting Side A Gender / Female Fitting Side A Type / NPT Fitting Side A Pipe Threading / 18 Fitting Side B Nominal Pipe Size / 1/4 in Fitting Side B Gender / Female Fitting Side B Type / NPT Fitting Side B Pipe Threading / 18 Color / White Standards / ASME B16.3, ASTM A197, FM Approved, IAPMO, UL Listed