https://www.pipenipples.com/specifications-and-types-of-plumbing-pipe-nipples.html 1. Specifications of plumbing pipe nipples Specifications of plumbing pipe nipples Specifications of plumbing pipe nipples are generally determined according to the difference in interface size. There are two types of plumbing pipe nipple specifications: 1/2 and 3/4. Because plumbing pipe nipples have different interface sizes, when purchasing plumbing pipe nipples, pay attention to whether the specifications are in line with your own water pipes, etc., so as to avoid the trouble of return and exchange due to non-conforming specifications.All Rights Reserved