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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Plugs with Square Drive
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Presure Class:
Steel: 150
Iron: 125 - Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 2 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
| 3 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 3 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 4 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
FM-Approved Low-Pressure Cast Iron Threaded Pipe Fittings
Suitable for use in fire-protection applications, these pipe fittings are made of cast iron, so they are brittle and can be quickly opened with the strike of a sledge hammer. They are also known as Pressure Class 125 fittings. Use in noncorrosive environments.
Plugs with Square Drive
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 125
- Specifications Met: FM Approved, UL Listed, ASTM A126, ASME B1.20.1, ASME B16.4
- Pipe Nipples and Pipe: Use Schedule 40 steel
| Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 1 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
| 1 1/4 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 1 1/2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 2 1/2 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 3 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 00000 |
| 4 | Solid | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |