This Beck nipple has a weld bead on the inside and is NPT threaded at both ends. Model is interchangeable with black cast iron or steel. For low-pressure plumbing applications including air, water, oil, natural gas, and steam. Certified for use in potable water applications. Item: Nipple Pipe Connection Type: Threaded on Both Ends Pipe Type: Pipe Nipple Pipe Schedule: 40 Seamless/Welded: Welded Material - Pipe: Black Steel Pipe Weld Type: Continuous Weld Pipe Size - Nominal: 1-1/2" Overall Pipe Length: 5-1/2" Pipe Thread Type: MNPT x MNPT Max. Pressure: 300 psi @ 150 Degrees F Max. Steam Pressure: 150 psi WSP @ 360 Degrees F Wall Thickness: 9/64" Inside Dia.: 1-39/64" Outside Dia.: 1-57/64" Standards: ASTM A-53 Type F, Grade A, ASTM A733 Metal Detectable: Yes