This polymer water supply line is used to connect toilet fill valve and stop valve. It has a 1/2"FIP inlet and a 7/8" outlet.
The nut is brass material on 1/2"FIP end. We have two choices for the 7/8" plastic nut - POM and Nylon 66. POM is more economical, but it is more brittle, while Nylon 66 is tough and more durable. Nylon 66 nut will not easily crack when tightened by wrench.