Features This GRAINGER APPROVED hex head plug is designed with 304 stainless steel for good corrosion resistance. Compatible with stainless steel Schedule 40 pipe. For use with air, water, oil, natural gas, and steam. Nominal Pipe Size / 1 in Pipe Fitting Material / 316L Stainless Steel, Stainless Steel Material Grade / 316L Class / Class 150 For Pipe Schedule / 40 Fitting Connection Type / Male NPT Outside Diameter / 1 in Overall Length / 34 mm Maximum Operating Pressure / 300 psi Max. Steam Pressure / 150 psi Temp. Range / -20 Degrees to 350 Degrees F Plug Drive Style / 3 in Hex Fitting Side A Pipe Threading / 11 1/2 Standards / ASTM A351