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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Medium-Pressure Pipe Fittings for Joining Dissimilar Metals
Use these unions to connect different metals in a piping or plumbing system. They have a plastic sleeve that inhibits destructive corrosion. Use them for connections that must be electrically insulated. Unions separate into three pieces for access to your line.
Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water, Oil, Natural Gas
- Max.Temperature: 180° F
Galvanized Iron × Galvanized Iron | Iron × Brass | |||||
|---|---|---|---|---|---|---|
Pipe Size | Lg. | Max. Pressure | Each | Each | ||
NPT Female | ||||||
| 1/2 | 2 1/4" | 250 psi @ 72° F | 0000000 | 000000 | 0000000 | 000000 |
| 3/4 | 2 1/4" | 250 psi @ 72° F | 0000000 | 00000 | 0000000 | 00000 |
| 1 | 2 1/2" | 250 psi @ 72° F | 0000000 | 00000 | 0000000 | 00000 |
| 1 1/4 | 2 3/4" | 250 psi @ 72° F | 0000000 | 00000 | 0000000 | 00000 |
| 1 1/2 | 2 3/4" | 250 psi @ 72° F | 0000000 | 00000 | 0000000 | 000000 |
| 2 | 3 1/8" | 250 psi @ 72° F | 0000000 | 000000 | 0000000 | 000000 |
- For Use With: Air, Water, Oil, Natural Gas
- Max.Temperature: 180° F
Iron × Copper | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Lg. | Copper Tube Size | For Tube OD | Max. Pressure | Each | |
NPT Female × Socket Connect Female | ||||||
| 1/2 | 1 7/8" | 1/2 | 5/8" | 250 psi @ 72° F | 000000 | 000000 |
| 1/2 | 1 7/8" | 3/8 | 1/2" | 250 psi @ 72° F | 00000000 | 00000 |
| 3/4 | 1 7/8" | 1/2 | 5/8" | 250 psi @ 72° F | 000000 | 00000 |
| 3/4 | 2 1/8" | 3/4 | 7/8" | 250 psi @ 72° F | 000000 | 00000 |
| 1 | 2 1/2" | 1 | 1 1/8" | 250 psi @ 72° F | 000000 | 00000 |
| 1 | 2 1/2" | 3/4 | 7/8" | 250 psi @ 72° F | 000000 | 00000 |
| 1 1/4 | 3" | 1 1/4 | 1 3/8" | 250 psi @ 72° F | 000000 | 00000 |
| 1 1/2 | 3" | 1 1/2 | 1 5/8" | 250 psi @ 72° F | 000000 | 00000 |
| 2 | 3" | 2 | 2 1/8" | 250 psi @ 72° F | 000000 | 000000 |
NPT Male × Socket Connect Female | ||||||
| 1/2 | 2 5/8" | 1/2 | 5/8" | 250 psi @ 72° F | 00000000 | 00000 |
| 1/2 | 3" | 3/8 | 1/2" | 250 psi @ 72° F | 00000000 | 00000 |
| 3/4 | 2 15/16" | 3/4 | 7/8" | 250 psi @ 72° F | 00000000 | 00000 |
| 3/4 | 3" | 1/2 | 5/8" | 250 psi @ 72° F | 00000000 | 00000 |
| 3/4 | 3" | 3/4 | 7/8" | 250 psi @ 72° F | 00000000 | 00000 |
Standard-Wall Galvanized Steel Pipe Nipples
and Pipe for Joining Dissimilar Metals
- For Use With: Water
- Max. Temperature: 225° F
- Fittings: Use 125 or 150 copper, galvanized iron, and galvanized steel
- Specifications Met: ASME B1.20.1, ASTM A53
A plastic sleeve prevents destructive corrosion when connecting different metals. Pipe is also known as Schedule 40 and is designed for low-pressure applications. It is galvanized steel, which has fair corrosion resistance. Pipe is welded, so there is a weld bead on the inside. Not for use in heating systems that use hot liquids or gas.
For technical drawings and 3-D models, click on a part number.
Press-Connect Fittings for Copper Tubing
- For Use With: Drinking Water
- Maximum Pressure: 200psi @ 72° F
- Temperature Range: 0° to 250° F
- Tubing: Use with K, M, L copper
- Specifications Met: See table
Crimp these fittings to copper tubing with a crimping tool (sold separately). An O-ring on the inside of the fitting creates a leak-tight connection that doesn’t require heat or soldering. They are comparable to Viega ProPress fittings. Fittings have good corrosion resistance. They meet NSF/ANSI safety standards for use with drinking water systems.
Unions separate into three pieces for easy access to your line. Union adapters for galvanized steel threaded pipe join copper tubing to galvanized threaded connections on hot water heaters.
Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.
For technical drawings and 3-D models, click on a part number.
| Copper Tube Size | For Tube OD | Pipe Size | Lg. | Material | Specifications Met | Each | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/2 | 5/8" | 1/2 | 2 15/64" | Bronze | ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213 | 00000000 | 000000 |
| 3/4 | 7/8" | 3/4 | 2 9/16" | Bronze | ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213 | 00000000 | 00000 |
| 1 | 1 1/8" | 1 | 2 9/16" | Bronze | ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213 | 00000000 | 00000 |
| 1 1/4 | 1 3/8" | 1 1/4 | 2 11/16" | Bronze | ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213 | 00000000 | 00000 |
| 1 1/2 | 1 5/8" | 1 1/2 | 3 7/64" | Bronze | ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213 | 00000000 | 000000 |
| 2 | 2 1/8" | 2 | 3 17/32" | Bronze | ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213 | 00000000 | 000000 |
