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 Stainless Steel Threaded Pipe Fittings
Use these fittings in a low-pressure pipe line.
Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/445/4452k224c2-c01d-digital-master1571347924-p9@halfx_637069608427934768.png?ver=imagenotfound)
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Fabrication: Heat Treated
- Specifications Met:
NPT: ANSI/MSS SP-114, ASTM A351
BSPP and BSPT: ASNI/MSS SP-114 - Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
Medium-Pressure Stainless Steel Threaded Pipe Fittings
Choose these fittings when you want the same high-quality found in our low-pressure pipe fittings, but need more strength to handle higher pressures.
Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking.
304 stainless steel fittings have very good corrosion resistance.
316 stainless steel fittings have excellent corrosion resistance.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/446/4464k98-@halfx_637636810733937817.png?ver=imagenotfound)
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 1000
- Specifications Met: ANSI/MSS SP-114, ASTM A182
- Pipe Nipples and Pipe: Use Schedule 40 stainless steel
- Flanges: Use Class 150 stainless steel
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections. They have a gasket that creates a tight seal.
For technical drawings and 3-D models, click on a part number.
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- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 steel
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.
Union connectors separate so you can access your line without unthreading pipe connections. They have a brass gasket that creates a tight seal.
For technical drawings and 3-D models, click on a part number.
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- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met: See table
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
Pipe Size | Max. Pressure | Max. Steam Pressure | Material | Gasket Material | Specifications Met | Each | |
NPT Female | |||||||
---|---|---|---|---|---|---|---|
2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Galvanized Iron | Brass | ASME B1.20.1, ASME B16.39, ASTM A197 | 00000000 | 0000000 |
High-Pressure Iron and Steel Threaded Pipe Fittings
These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
Phosphate-coated and zinc-phosphate-coated fittings offer some corrosion resistance, but aren't intended for corrosive environments.
Note: The maximum pressure listed for Class 3000 fittings is for conditions where there are no sudden changes in pressure or velocity. Please refer to ASME B16.11 to determine the specific maximum operating pressure for your application.
For technical drawings and 3-D models, click on a part number.
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- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: 3000
- Specifications Met: MSS SP-83, ASME B1.20.1, ASTM A105
- Pipe Nipples and Pipe: Use Schedule 160 steel
- Flanges: Use Class 1500 steel
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | ||||||
---|---|---|---|---|---|---|
2 1/2 | 40 | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 0000000 |
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- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Pressure Class: 3000
- Specifications Met: MSS SP-83, ASME B1.20.1, ASTM A105
- Pipe Nipples and Pipe: Use Schedule 160 steel
- Flanges: Use Class 1500 steel
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | ||||||
---|---|---|---|---|---|---|
2 1/2 | 40 | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 0000000 |
Medium-Pressure Iron and Steel Threaded Pipe Fittings
With better strength than our low-pressure iron and steel pipe fittings, these can handle medium-pressure applications. They are for use in noncorrosive environments.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/462/4627k-union_render-onlymultipositive_front_positive_right_flop15_1641239523_826@halfx_637768147998543059.png?ver=imagenotfound)
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class : 300
- Specifications Met: ASTM A197, UL Listed, ASME B16.39, ASME B1.20.1
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 or 600 steel
Pipe Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | |||||
---|---|---|---|---|---|
2 1/2 | 600 psi @ 72° F | 230 psi @ 550° F | Iron | 00000000 | 0000000 |
High-Pressure Socket-Connect Steel Unthreaded Pipe Fittings
Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings have heavy duty construction that stands up to high-pressure applications. They are for use in noncorrosive environments.
Union straight connectors separate into three pieces for access to your line.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/450/45005k253c1-c01d-digital-master1571434341-p9@halfx_637070724183021139.png?ver=imagenotfound)
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class : 3000
- Specifications Met: ASTM A105, MSS SP-83
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 and 600 steel
Pipe Size | Max. Pressure | Material | Each | |
2 1/2 | 3,000 psi @ 72° F | Steel | 000000000 | 0000000 |
Low-Pressure Brass and Bronze Threaded Pipe Fittings
Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/442/4429k213-@halfx_637598850534444359.png?ver=imagenotfound)
- For Use With:
NPT: Air, Drinking Water, Natural Gas, Oil
BSPT: Air, Natural Gas, Oil, Steam, Water - Pressure Class: 125
- Specifications Met:
NPT: ASME B1.20.1, ASME B16.15, NSF/ANSI 61
BSPT: ASME BS21, ASTM B584 - Pipe Nipples and Pipe: Use Schedule 40 brass
- Flanges:
NPT: Use Class 150 brass
BSPT: Use Class 150 bronze
Pipe Size | Max. Pressure | Material | Each | |
NPT Female | ||||
---|---|---|---|---|
2 1/2 | 200 psi @ 72° F | Brass | 00000000 | 0000000 |
Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
Union connectors separate into three pieces so you can access your line without unthreading pipe connections.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/447/44705k243-@halfx_637661920738086843.png?ver=imagenotfound)
- For Use With: Air, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- Flanges: Use Class 125 aluminum
Pressure Class | Pipe Size | Max. Pressure | Each | |
NPT Female | ||||
---|---|---|---|---|
150 | 2 1/2 | 150 psi @ 72° F | 000000000 | 0000000 |
Thick-Wall Plastic Pipe Fittings for Water
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Connect these fittings to Schedule 80 pipe–they have thicker, stronger walls than standard-wall fittings so they can handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. Fittings are plastic for good corrosion resistance. They meet ASTM specifications and testing requirements for material quality.
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. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections.
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.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/488/4881k62-@halfx_637576971114456958.png?ver=imagenotfound)
- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Unions separate into three pieces so you can access your line.
Pipe Size | Socket Depth | Material | O-Ring Material | Color | Each | |
2 1/2 | 1 23/32" | PVC Plastic | EPDM Rubber | Dark Gray | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/459/4596k63-@halfx_637576393141426470.png?ver=imagenotfound)
- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Unions separate into three pieces so you can access your line.
Pipe Size | Material | O-Ring Material | Color | Each | |
NPT Threads | |||||
---|---|---|---|---|---|
2 1/2 | PVC Plastic | EPDM Rubber | Dark Gray | 0000000 | 0000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/488/4881k043-@halfx_637576402438960162.png?ver=imagenotfound)
- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Unions separate into three pieces so you can access your line.
Pipe Size | Socket Depth | OD | ID | Wall Thick. | Material | O-Ring Material | Color | Each | |
2 1/2 | 1 3/4" | 2 7/8" | 2.323" | 0.276" | PVC Plastic | EPDM Rubber | Dark Gray | 00000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/459/4596k642-@halfx_637576977691523842.png?ver=imagenotfound)
- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Unions separate into three pieces so you can access your line.
Pipe Size | Socket Depth | Material | O-Ring Material | Color | Max. Pressure | Each | |
NPT Threads | |||||||
---|---|---|---|---|---|---|---|
2 1/2 | 1 3/4" | PVC Plastic | EPDM Rubber | Dark Gray | Not Rated @ Not Rated | 00000000 | 0000000 |
Standard-Wall Plastic Pipe Fittings for Water
![](/prerenderstable/mvPRE/contents/gfx/imagecache/488/4880k72-4880k772-48925k92c1-c01d-digital-master1575325836-p9@halfx_637109062051494146.png?ver=imagenotfound)
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. 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.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/488/4880k302p1-c01d-digitall@halfx_637114881620188852.png?ver=imagenotfound)
- 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 Schedule 40 PVC Plastic
Unions separate into three pieces so you can access your line.
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 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/488/4880k372p1-c01d-digitall@halfx_637114883120625269.png?ver=imagenotfound)
- 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 Schedule 40 PVC Plastic
Unions separate into three pieces so you can access your line.
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 |
CPVC Pipe Fittings for Hot Water
![](/prerenderstable/mvPRE/contents/gfx/imagecache/682/6826k342-6826k43-6803k74c1-c01d-digital-master1575325839-p9@halfx_637109063580572393.png?ver=imagenotfound)
Made of CPVC, these fittings can handle high temperatures. They have thick, strong walls to handle heavy duty industrial plumbing and water supply applications, such as water processing and waste water treatment. They also have good corrosion resistance. These fittings are comparable to Corzan. Some meet ASTM D1784 specifications and testing requirements for material quality.
Fittings for drinking water meet NSF/ANSI Standard 61.
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.
Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local regulatory limits on VOCs (Volatile Organic Compounds).
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/682/6826k63-@halfx_637577081483961047.png?ver=imagenotfound)
- For Use With: Acetic Acid (10%), Calcium Chloride, Deionized Water, Drinking Water, Hydrochloric Acid (25%), Nitric Acid (10%), Phosphoric Acid (85%), Salt Water, Sulfuric Acid (75%), Water
- Maximum Temperature: 200° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 CPVC Plastic
- Flanges: Use Class 150 CPVC Plastic
Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a CPVC primer and cement (also known as solvent weld).
Unions separate into three pieces so you can access your line.
Pipe Size | Socket Depth | Material | O-Ring Material | Schedule | Color | Max. Pressure | Each | |
2 1/2 | 1 3/4" | CPVC Plastic | EPDM Rubber | 80 | Light Gray | Not Rated | 00000000 | 0000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/458/4589k73-@halfx_637577078353185837.png?ver=imagenotfound)
- For Use With:
Fittings with EPDM Rubber O-Rings: Drinking Water, Water
All other fittings: Acetic Acid (10%), Calcium Chloride, Deionized Water, Drinking Water, Hydrochloric Acid (25%), Nitric Acid (10%), Phosphoric Acid (85%), Salt Water, Sulfuric Acid (75%), Water - Maximum Temperature: 200° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 CPVC Plastic
- Flanges: Use Class 150 CPVC Plastic
To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant to the male threads. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Unions separate into three pieces so you can access your line.
Pipe Size | Material | O-Ring Material | Schedule | Color | Max. Pressure | Each | |
NPT Threads | |||||||
---|---|---|---|---|---|---|---|
2 1/2 | CPVC Plastic | EPDM Rubber | 80 | Light Gray | Not Rated | 00000000 | 0000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/458/4589k192-@halfx_637577079880438287.png?ver=imagenotfound)
- For Use With: Drinking Water, Water
- Maximum Temperature: 200° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 CPVC Plastic
- Flanges: Use Class 150 CPVC Plastic
Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a CPVC primer and cement (also known as solvent weld).
To prevent leaks in threaded connections, apply a non-hardening, plastic-compatible sealant to the male threads. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Unions separate into three pieces so you can access your line.
Pipe Size | Socket Depth | Material | O-Ring Material | Schedule | Color | Max. Pressure | Each | |
NPT Threads | ||||||||
---|---|---|---|---|---|---|---|---|
2 1/2 | 1 3/4" | CPVC Plastic | EPDM Rubber | 80 | Light Gray | Not Rated | 00000000 | 0000000 |