Features This Grainger Approved square head plug can withstand higher pressures than class 150 fittings. Model is suitable for air, water, oil, natural gas, and steam. Note: Fitting must be used with properly rated nipples. Nominal Pipe Size / 1 in Pipe Fitting Material / Malleable Iron Finish/Coating / Galvanized Class / Class 300 Fitting Connection Type / Male NPT Maximum Operating Pressure / 2,000 psi @ 150 Degrees F Includes Pre-Applied Thread Sealant / No Includes Seal / No Standards / ASME B16.3, ASME B16.4, ASTM A197, ASTM A47, FM Approved, UL Listed