Features This Grainger Approved reducer 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 Class / Class 300 Fitting Side A Type / NPT Fitting Side B Type / NPT Maximum Operating Pressure / 1,500 psi Standards / ASME B16.3, ASTM A197, ASTM A47, FM Approved, UL Listed