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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Standard-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 40 plastic pipe–they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.
Fittings for drinking water meet NSF/ANSI Standard 61.
Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).
To prevent leaks in threaded connections, apply a sealant to the male threads. Threaded connections can be taken apart as needed for maintenance and repair. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. Fittings that meet ASTM D1784, ASTM D1785, and ASTM D4066 adhere to specifications and testing requirements for material quality.
Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.

- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Unions separate into three pieces so you can access your line without unthreading pipe connections.
Pipe Size | Socket Depth | Material | O-Ring Material | Color | Specifications Met | Each | |
2 1/2 | 1 3/4" | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 000000 |
4 | 2" | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 00000 |
6 | 3" | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 000000 |

- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Unions separate into three pieces so you can access your line without unthreading pipe connections.
Pipe Size | Material | O-Ring Material | Color | Specifications Met | Each | |
NPT Threads | ||||||
---|---|---|---|---|---|---|
2 1/2 | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 000000 |
3 | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 00000 |
4 | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 00000 |
6 | PVC Plastic | EPDM Rubber | White | ASTM D1784, NSF/ANSI 61, SAE AS568 | 00000000 | 000000 |