'Nipple, Pipe Schedule 80, Seamless, Pipe Connection Type Threaded on Both Ends, Black Steel, Pipe Size - Nominal 4 In., Overall Pipe Length 12 In., Pipe Thread Type MNPT x MNPT, Max. Pressure 1000 psi @ 150 Degrees F, Max. Steam Pressure 300 psi WSP @ 550 Degrees F, Wall Thickness 21/64 In., Inside Dia. 4 In., Outside Dia. 4-1/2 In., Standards ASTM A106 Grade B Seamless Pipe; ASTM A733'