Add an NPT port to any steel tank with these female NPT threaded fittings. A 1/4" deep flange at the base makes welding easier. Unplated mild steel. Sold individually.
| NPT Thread | Outside Diameter
at Base | Outside Diameter
of Flange | Part No. |
|---|
| 1/8 | 3/4" | 1/2" | 3228-125-02 |
|---|
| 1/4 | 1" | 3/4" | 3228-125-04 |
|---|
| 3/8 | 1 3/16" | 7/8" | 3228-125-06 |
|---|
| 1/2 | 1 3/8" | 1" | 3228-125-08 |
|---|
| 3/4 | 1 5/8" | 1 1/4" | 3228-125-12 |
|---|
| 1 | 2" | 1 5/8" | 3228-125-16 |
|---|
Note: NPT nomenclature can be confusing! The nominal size refers to the inside diameter of the pipe, not the outside diameter of the threads. If you are not sure what size you need (even if you are sure), please check in our Threaded Plumbing Fitting Identification Guide.
NPT fittings can also cause concern because of the way they fit together. The threads are tapered to seal by an interference fit, which means that a properly-sized NPT fitting should never bottom out in the port. The male fitting should "jam" when screwed about halfway in. More information and torque recommendations can be found in our Guide to Using NPT Fittings.
