The Grainger Approved Black Pipe Nipple is a threaded pipe fitting made from black steel. It has National Pipe Thread ends and is available in sizes ranging from 1/8" to 2" diameter, and lengths from 1" to 12". It can be used to extend and connect black steel piping in applications like plumbing, gas lines, and industrial pipe systems. The nipple is rated to 150 psi working pressure and is manufactured in the USA to ASTM A733 standards.