Check the listing for details. GRAINGER APPROVED 1RKK1 Nipple,1/2".,Close,Galvanized Steel 1RKK1. Condition: New. Listed at 3.14 USD. Nipple, Application Air, Gas, Potable Water, Finish/Coating Galvanized, Fitting Compatibility Class 6000, Gravity Flow No, Inside Diameter 27/32 in, Manufacture Location Globally Sourced, Material Steel, Maximum Operating Pressure 900 psi @ 150 Degrees F, Maximum Steam Pressure 6237 psi @ 650 Degrees F, Metal Pipe Construction Seamless, Nominal Pipe Size 1/2 in, Outside Diameter 53/64 in, Overall Length 1 1/8 in, Pipe Weld Type Electric Resistance Weld, Schedule Schedule 160 This GRAINGER APPROVED pipe nipple is suitable for use with air, water, oil, natural gas, and steam in high-pressure, high-temperature boiler applications.• NPT threads at both ends allow for easy connections• Nipple must be used with properly rated fittings.