- The Nipple Threads are National Pipe Thread (NPT), also known as American National Standard Taper Pipe Thread.
- This 1-1/2 X 1-3/4 close nipple is the common thread used for threaded pipe connections in the United States.
- NPT is defined by ANSI/ASME standard B1.20.1
**Picture is for illustration purposes only, actual item may differ