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About Pipe and Fittings
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Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
Straight Adapters with Extension for Flat Tanks
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Specifications Met: ASTM A181, ASME B1.20.1
Pipe Size | For Hole Dia. | OD | Lg. | Material | Each | |
NPT Female × Weld | ||||||
|---|---|---|---|---|---|---|
| 1/8 | 15/16" | 1 5/16" | 3/8" | Carbon Steel | 12555K79 | 00000 |
| 1/8 | 15/16" | 1 1/2" | 9/16" | Carbon Steel | 12555K69 | 0000 |
| 1/4 | 15/16" | 1 5/16" | 3/8" | Carbon Steel | 12555K81 | 0000 |
| 1/4 | 15/16" | 1 1/2" | 9/16" | Carbon Steel | 12555K71 | 0000 |
| 3/8 | 15/16" | 1 5/16" | 3/8" | Carbon Steel | 12555K82 | 0000 |
| 3/8 | 15/16" | 1 1/2" | 9/16" | Carbon Steel | 12555K72 | 0000 |
| 1/2 | 1 1/8" | 1 5/8" | 7/16" | Carbon Steel | 12555K83 | 0000 |
| 1/2 | 1 1/8" | 1 3/4" | 5/8" | Carbon Steel | 12555K73 | 0000 |
| 3/4 | 1 5/16" | 1 15/16" | 1/2" | Carbon Steel | 12555K84 | 0000 |
| 3/4 | 1 3/8" | 2 1/8" | 11/16" | Carbon Steel | 12555K74 | 0000 |
| 1 | 1 5/8" | 2 3/8" | 3/4" | Carbon Steel | 12555K75 | 0000 |
| 1 | 1 11/16" | 2 1/4" | 9/16" | Carbon Steel | 12555K85 | 0000 |
| 1 1/4 | 2" | 2 9/16" | 9/16" | Carbon Steel | 12555K86 | 00000 |
| 1 1/4 | 2" | 2 11/16" | 3/4" | Carbon Steel | 12555K76 | 0000 |
| 1 1/2 | 2 1/4" | 2 13/16" | 9/16" | Carbon Steel | 12555K87 | 0000 |
| 1 1/2 | 2 1/4" | 3" | 3/4" | Carbon Steel | 12555K77 | 0000 |
| 2 | 2 5/8" | 3 3/8" | 5/8" | Carbon Steel | 12555K88 | 0000 |
| 2 | 2 5/8" | 3 1/2" | 27/32" | Carbon Steel | 12555K78 | 00000 |
| 2 1/2 | 3 1/8" | 4 1/16" | 1" | Carbon Steel | 12555K89 | 00000 |
| 3 | 3 5/8" | 4 5/8" | 1" | Carbon Steel | 12555K91 | 00000 |
| 4 | 4 11/16" | 5 13/16" | 1 7/32" | Carbon Steel | 12555K92 | 00000 |
Straight Adapters for Flat Tanks
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Specifications Met: ASTM A105, ASTM A181
| Pipe Size | For Hole Dia. | OD | Lg. | Material | Each | |
NPT Female × Weld | ||||||
|---|---|---|---|---|---|---|
| 1/4 | 3/4" | 1 1/4" | 5/16" | Carbon Steel | 12555K51 | 00000 |
| 3/8 | 15/16" | 1 1/4" | 3/8" | Carbon Steel | 12555K52 | 00000 |
| 1/2 | 1 1/8" | 1 1/2" | 1/2" | Carbon Steel | 12555K53 | 0000 |
| 3/4 | 1 3/8" | 1 3/4" | 5/8" | Carbon Steel | 12555K54 | 0000 |
| 1 | 1 11/16" | 2 1/8" | 5/8" | Carbon Steel | 12555K55 | 0000 |
| 1 1/4 | 2" | 2 1/2" | 3/4" | Carbon Steel | 12555K56 | 0000 |
| 1 1/2 | 2 3/8" | 3" | 3/4" | Carbon Steel | 12555K57 | 00000 |
| 2 | 2 7/8" | 3 1/2" | 13/16" | Carbon Steel | 12555K58 | 00000 |
| 2 1/2 | 3 1/2" | 4 1/4" | 1" | Carbon Steel | 12555K59 | 00000 |
| 3 | 4 1/8" | 4 3/4" | 1" | Carbon Steel | 12555K61 | 00000 |
| 4 | 5 1/8" | 5 3/4" | 1 3/16" | Carbon Steel | 12555K62 | 00000 |
Straight Adapters for Curved Tanks
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 steel