| - | Features |
|---|---|
| #1 | Male national pipe taper (NPT) threads on both ends for connecting female threaded pipes and fittings |
| #2 | Made from steel for greater rust resistance than iron |
| #3 | NPT threads for creating tighter seals than straight threads |
| #4 | Application - water and oil |
| #6 | Male national pipe taper (NPT) threads on both ends for connecting female threaded pipes and fittings |