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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Metal Round Caps
More durable than plastic caps, these provide the most protection from abrasion and impact.
Steel caps are stronger than aluminum.
Aluminum caps have good corrosion resistance, are lightweight, and are nonmagnetic.
Stainless steel caps have excellent corrosion resistance, making them the best choice for harsh environments. They also have good chemical resistance.
For technical drawings and 3-D models, click on a part number.
Tapered Caps
These flexible plastic caps are tapered to fit a variety of unthreaded and threaded objects.
For technical drawings and 3-D models, click on a part number.
| For OD | For Pipe Size  | Inside Ht. | Max. Temp., °F | Color | Pkg. Qty. | Pkg. | |
Flexible Polyethylene Plastic | |||||||
|---|---|---|---|---|---|---|---|
| 3.94"-4.07" | 3 1/2 | 3/4" | 150° | Red | 25 | 00000000 | 000000 |
| For OD | For Pipe Size | Inside Ht. | Max. Temp., °F | Color | Pkg. Qty. | Pkg. | |
Flexible Polyethylene Plastic | |||||||
|---|---|---|---|---|---|---|---|
| 3.71"-3.84" | 3 1/2 | 3/4" | 150° | Red | 25 | 00000000 | 000000 |
Adhesive-Back Flange Caps
Stick these caps on the raised surfaces of flanges or other flat surfaces for extra protection during transport and storage.
For technical drawings and 3-D models, click on a part number.
| For Pipe Size | For OD | Adhesive Type | Max. Temp., °F | Color | Pkg. Qty. | Pkg. | |
Rigid Plastic | |||||||
|---|---|---|---|---|---|---|---|
| 3 1/2 | 5 1/2" | Rubber | 160° | Black | 4 | 0000000 | 000000 |
Hollow Tapered Plugs
The hollow construction allows these plugs to compress for a snug fit in threaded and unthreaded holes of varying diameters. Use the flange to remove them with ease.
For technical drawings and 3-D models, click on a part number.
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
- 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 | ||||||
|---|---|---|---|---|---|---|
| 3 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
- For Use With:
NPT and BSPT: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water - Pressure Class:
NPT Iron: 125
BSPT Iron: 150 - Specifications Met:
See table - Pipe Nipples and Pipe:
NPT and BPST: Use Schedule 40 steel
| Pipe Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | ||||||
|---|---|---|---|---|---|---|
| 3 1/2 | Hollow | 175 psi @ 72° F | 125 psi @ 350° F | Iron | 000000000 | 000000 |
Low-Pressure Steel Threaded Pipe Flanges
Use these flanges for low-pressure applications in noncorrosive environments. Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: 150
- Specifications Met:
NPT: ASME B16.5, ASTM A105, MSS SP-25
BSPT: ASTM A105 - Fittings: Use Class 125 or 150 iron and steel
- Pipe Nipples and Pipe: Use Schedule 40 steel
Bolt Hole | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT | ||||||||||
| 3 1/2 | 8 1/2" | 5/8" | 3/4" | 8 | 7" | 285 psi @ 72° F | 230 psi @ 300° F | Steel | 000000000 | 0000000 |
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.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Specifications Met:
NPT Steel: SAE J531
NPT Iron: ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed
BSPT: ASTM A197, DIN EN 10226 - Pipe Nipples and Pipe: Use Schedule 40 steel
- Flanges: Use Class 150 galvanized steel
| Pipe Size | Plug Construction | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 3 1/2 | Hollow | 125 | 125 psi @ 72° F | 125 psi @ 350° F | Galvanized Iron | 00000000 | 0000000 |
FM-Approved Low-Pressure Cast Iron Unthreaded Pipe Flanges
- For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Steam, Water
- Pressure Class: 125
- Specifications Met: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Class 125 or 150 iron and steel
FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer. Bolt them together with a gasket (not included) to create an access point within a low-pressure pipe line. All are cap flanges, which are also known as blind flanges. Use them in noncorrosive environments.
For technical drawings and 3-D models, click on a part number.
Bolt Hole | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Each | |
| 3 1/2 | 8 1/2" | 5/8" | 3/4" | 8 | 7" | 200 psi @ 72° F | 165 psi @ 300° F | 0000000 | 0000000 |
Wing Nut Expansion Plugs
Twist the wing nut on these plugs to expand the seal and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.
For Pipe | Max. Back Pressure | |||||||
|---|---|---|---|---|---|---|---|---|
| Size | ID | Air, psi | Water, ft. of head | O'all Ht. | Temp. Range, °F | Seal Material | Each | |
Style A | ||||||||
Stainless Steel Plate | ||||||||
| 3 1/2 | 3.44"-3.60" | 5 | 12 | 2 15/16" | 0° to 175° | Neoprene Rubber | 0000000 | 000000 |
Hex-Nut Expansion Plugs
Tighten the nut on these plugs to expand the seal and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.
Plugs with a stainless steel plate have excellent corrosion resistance.
For Pipe | Max. Back Pressure | |||||||
|---|---|---|---|---|---|---|---|---|
| Size | ID | Air, psi | Water, ft. of head | O'all Ht. | Temp. Range, °F | Seal Material | Each | |
Style B | ||||||||
Stainless Steel Plate | ||||||||
| 3 1/2 | 3.44"-3.60" | 5 | 12 | 3 1/16" | -40° to 250° | Neoprene Rubber | 0000000 | 000000 |
T-Handle Expansion Plugs
Twist the easy-grip T-handle on these plugs to expand the seal and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.
Plugs with a zinc-plated steel plate have fair corrosion resistance.
Plugs with a stainless steel plate have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
For Pipe | Max. Back Pressure | |||||||
|---|---|---|---|---|---|---|---|---|
| Size | ID | Air, psi | Water, ft. of head | O'all Ht. | Temp. Range, °F | Seal Material | Each | |
Brass Handle | ||||||||
Zinc-Plated Steel Plate | ||||||||
| 3 1/2 | 3.44"-3.60" | 5 | 12 | 3 15/16" | -40° to 250° | Neoprene Rubber | 0000000 | 000000 |
Stainless Steel Handle | ||||||||
Stainless Steel Plate | ||||||||
| 3 1/2 | 3.44"-3.60" | 5 | 12 | 3 15/16" | -40° to 250° | Neoprene Rubber | 0000000 | 00000 |
Quick-Snap Expansion Plugs
Turn the cam handle to expand the seal, then snap the handle down to hold it in place and close off pipe openings. Maximum air back pressure is the amount of pressure a plug can withstand without moving. Maximum water back pressure refers to the pressure resulting from the height of the water above the plug.
Plugs with a zinc-plated steel plate have fair corrosion resistance.
Plugs with a stainless steel plate have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
For Pipe | Max. Back Pressure | Brass Handle | Stainless Steel Handle | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | ID | Air, psi | Water, ft. of head | O'all Ht. | Temp. Range, °F | Seal Material | Each | Each | ||
Zinc-Plated Steel Plate | ||||||||||
| 3 1/2 | 3.38"-3.60" | 5 | 12 | 2 5/16" | -40° to 250° | Neoprene Rubber | 0000000 | 000000 | 000000 | 00 |
Stainless Steel Plate | ||||||||||
| 3 1/2 | 3.38"-3.60" | 5 | 12 | 2 5/16" | -40° to 250° | Neoprene Rubber | 000000 | 00 | 0000000 | 000000 |
Cleanout Plugs
Close off your drain cleanout pipe with these threaded plugs. Note: If you do not know your pipe size, measure the OD of your existing cleanout plug or the ID of your cleanout fitting and match to the value listed.