The Black Pipe Nipple Threaded 3/4x1-3/8 In is a black steel pipe nipple with National Pipe Thread (NPT) threads on both ends. It has a nominal pipe size of 3/4 inch, an overall length of 1-3/8 inches, and is made from ASTM A53 Grade B seamless black steel pipe. This nipple allows you to connect and extend black steel piping and is ideal for use in industrial plumbing, hydraulic systems, and process piping applications. The nipple has a working pressure rating of 6,000 psi and temperature range of -20°F to 800°F. It is manufactured in the USA and meets ASME B16.3 specifications.