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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Underground PVC Pipe Fittings for Drain, Waste, and Vent
With thinner walls than Schedule 40 fittings, these are lighter in weight and have more space on the inside for high-flow applications, such as underground gravity-flow sewer and storm drainage lines. They are also known as SDR 35 fittings. Made of PVC, they have good strength and corrosion resistance. All meet an ASTM specification and testing requirement for material quality, dimensions, and workmanship. Gasket-connect ends slip together and withstand slight shifts without cracking. Lubricate gasket-connect ends then insert unthreaded pipe using a pipe joiner (sold separately).
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.
High-Polish Gasket Fittings for Stainless Steel Tubing

- For Use With: Air, Dairy, Water
- Temperature Range: See Gaskets
- Tubing:
Inch Butt-Weld Fittings and Quick-Clamp Fittings: Use with welded 304/304L or 316/316L stainless steel that meets ASTM 269 or ASTM 27
Metric Butt-Weld Fittings: Use with welded or seamless 316 stainless steel - Specifications Met:
304 Stainless Steel Adapters, Caps, and Nuts: 3-A Certified 63-04
Gaskets: See table
Join these fittings with a threaded nut and a gasket for a secure connection that grants you easy access to your line. Also known as bevel seat fittings, the fittings are beveled to fit snugly around the gasket, creating a vibration-resistant seal. Fittings are polished to a smooth finish on the interior to prevent product buildup and bacterial growth.
304 stainless steel fittings have very good corrosion resistance. They’re 3-A certified to meet sanitary design standards.
Note: For a complete connection, you’ll need a threaded straight adapter, an unthreaded straight adapter, a gasket, and a nut (all sold separately unless noted).
For technical drawings and 3-D models, click on a part number.

For Tube OD | Material | Max. Pressure | Each | |
1" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
1 1/2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
2 1/2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
3" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
4" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |

For Tube OD | Nut Material | Max. Pressure | Each | |
1" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 000000 |
1 1/2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
2 1/2" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
3" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |
4" | 304 Stainless Steel | 400 psi @ 72° F | 000000000 | 00000 |

For Tube OD | ID | OD | Thick. | Temp. Range, °F | Color | Specifications Met | Each | |
Buna-N Rubber | ||||||||
---|---|---|---|---|---|---|---|---|
1" | 0.900" | 1.325" | 0.3" | -30° to 200° | Black | __ | 0000000 | 00000 |
1 1/2" | 1 3/8" | 1 7/8" | 0.33" | -30° to 200° | Black | __ | 0000000 | 0000 |
2" | 1.850" | 2 3/8" | 0.35" | -30° to 200° | Black | __ | 0000000 | 0000 |
2 1/2" | 2.340" | 2.950" | 0.35" | -30° to 200° | Black | __ | 0000000 | 0000 |
3" | 2 7/8" | 3.475" | 0.35" | -30° to 200° | Black | __ | 0000000 | 0000 |
4" | 3.700" | 4 1/2" | 0.45" | -30° to 200° | Black | __ | 0000000 | 0000 |
PTFE Plastic | ||||||||
1" | 0.900" | 1.325" | 0.3" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
1 1/2" | 1 3/8" | 1 7/8" | 0.33" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
2" | 1.850" | 2 3/8" | 0.35" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
2 1/2" | 2.340" | 2.950" | 0.35" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
3" | 2 7/8" | 3.475" | 0.35" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
4" | 3.700" | 4 1/2" | 0.33" | -100° to 500° | White | 3-A Certified 20-27 | 0000000 | 0000 |
316 Stainless Steel/PTFE Plastic Blend | ||||||||
1" | 0.900" | 1.325" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
1 1/2" | 1 3/8" | 1 7/8" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
2" | 1.850" | 2 3/8" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
2 1/2" | 2.340" | 2.950" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
3" | 2 7/8" | 3.475" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
4" | 3.700" | 4 1/2" | 0.32" | -350° to 550° | Gray | 3-A Certified 20-27, FDA Compliant 21 CFR 177.1550, USP VI Certified | 0000000 | 00000 |
Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing

- For Use With: Argon, Helium, Nitrogen
- Temperature Range: -420° to 1000° F
- Tubing: Use with 316/316L stainless steel
- Compatible With: Swagelok® VCR
The 15 Ra finish on the interior of these fittings creates an ultra-smooth surface. Also known as ultra-high-purity fittings, they are packed in a Class 100 clean room to prevent contamination. They are commonly used in semiconductor applications. Fittings use a metal gasket (sold separately), which generates fewer particles than a rubber gasket and creates a strong seal in high-pressure and high-vacuum applications. Fittings are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.

Use a female nut to connect a threaded adapter or a Yor-Lok adapter with a butt-weld adapter.