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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Pressure Test Fittings
Check pressure without permanently installing a gauge. Fittings have an NPT male connection for installation in your pipe or tank. Wrench-tighten the fitting onto your equipment, then insert the gauge adapter (sold separately) into the fitting. Connect gauge adapters to gauges with 1/4 pipe size NPT male threads.
Plugs | Gauge Adapters | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Thread Size | Thread Pitch, mm | Max. Pressure, psi | Gasket Material | Ht. | For Use With | Each | Each | ||
NPT Male × UNF Male | ||||||||||
Brass | ||||||||||
| 1/8 | 3/8"-24 | __ | 1,000 | EPDM Rubber | 7/16" | Air, Water | 0000000 | 00000 | 0000000 | 000000 |
| 1/4 | 3/8"-24 | __ | 1,000 | EPDM Rubber | 7/16" | Air, Water | 0000000 | 0000 | 0000000 | 00000 |
NPT Male × Metric Male | ||||||||||
Steel | ||||||||||
| 1/8 | M16 | 2 | 5,800 | Fluoroelastomer Rubber | 1 1/2" | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Water | 0000000 | 00000 | 0000000 | 00000 |
| 1/4 | M16 | 2 | 5,800 | Fluoroelastomer Rubber | 1 1/2" | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Water | 0000000 | 00000 | 0000000 | 00000 |
Quick-Install Pressure Test Fittings
 |  NPT Female Inlet × NPT Male Outlet Adapter with Intermittent Swivel |  NPT Male Inlet × NPT Female Outlet Adapter |
 NPT Male Inlet × NPT Female Outlet Adapter with Intermittent Swivel |  NPT Male Inlet Plug |
Thread these fittings onto your testing equipment by hand for a secure connection in testing applications—no tools, tape, or sealant required. Use them with gauges and other equipment as a temporary connection. When pressure is applied, the O-ring on the outlet presses against the testing equipment, creating a tight seal.
Adapters with intermittent swivel rotate 360° until tightened for easy installation.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Max. Pressure, psi | Temperature Range, °F | Gasket Material | For Use With | Each | |
NPT Female Inlet × NPT Male Outlet Adapter with Intermittent Swivel | ||||||
|---|---|---|---|---|---|---|
416 Stainless Steel | ||||||
| 1/8 × 1/8 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 0000000 |
| 1/4 × 1/4 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/8 × 3/8 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/2 × 1/2 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/4 × 3/4 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1 × 1 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
NPT Male Inlet × NPT Female Outlet Adapter | ||||||
416 Stainless Steel | ||||||
| 1/8 × 1/8 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/4 × 1/4 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/8 × 3/8 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/2 × 1/2 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/4 × 3/4 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1 × 1 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
NPT Male Inlet × NPT Female Outlet Adapter with Intermittent Swivel | ||||||
416 Stainless Steel | ||||||
| 1/8 × 1/8 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/4 × 1/4 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/8 × 3/8 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/2 × 1/2 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/4 × 3/4 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1 × 1 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
NPT Male Inlet Plug | ||||||
416 Stainless Steel | ||||||
| 1/8 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/4 | 5,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/8 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1/2 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 3/4 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
| 1 | 4,000 | -65° to 212° | Polyurethane Rubber | Air, Argon, Diesel Fuel, Fuel Oil, Gasoline, Hydraulic Fluid, Hydraulic Fluid (Petroleum Based), Natural Gas, Nitrogen, Oxygen, Water | 0000000 | 000000 |
Quick-Disconnect Hose Couplings for Pressure Testing
Add quick connection points for mechanical gauges and other diagnostic equipment to your line. These couplings are also known as test ports and diagnostic couplings. To take a reading, connect a socket to your gauge using a hose assembly. Then push the socket into a plug that’s permanently threaded into a test port on your line. No threading or unthreading is necessary. Add additional plugs to your line to take measurements at different points. To quickly move the gauge to a different test port, pull back the sleeve on the socket to disengage.
A complete coupling consists of a plug and socket (both sold separately). The plug and socket both have a shut-off valve to stop flow when the coupling is separated, so they're sometimes called double shut-off couplings. They meet ISO 15171-1, which is an international standard for dimensional and performance standards of flat-face diagnostic push-to-connect couplings.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 6,000 psi @ 72° F
- Maximum Vacuum: 27.4 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: Parker PD-Series, Eaton/Aeroquip FD90, Faster DF
- Specifications Met: ISO 15171-1, SAE J1502
Plugs are also known as nipples.
- Maximum Pressure: 6,000 psi @ 72° F
- Maximum Vacuum: 27.4 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: Parker PD-Series, Eaton/Aeroquip FD90, Faster DF
- Specifications Met: ISO 15171-1, SAE J1502
Plugs are also known as nipples.
- Maximum Pressure: 6,000 psi @ 72° F
- Maximum Vacuum: 27.4 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: Parker PD-Series, Eaton/Aeroquip FD90, Faster DF
- Specifications Met: ISO 15171-1, SAE J1502
Plugs are also known as nipples.
UN/UNF (SAE Straight) male threads have a gasket to prevent leaks. They’re also known as O-ring boss threads.
- Maximum Pressure: 6,000 psi @ 72° F
- Maximum Vacuum: 27.4 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: Parker PD-Series, Eaton/Aeroquip FD90, Faster DF
- Specifications Met: ISO 15171-1, SAE J1502
Push-to-connect sockets form a coupling when you push the plug into the socket and hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
- Maximum Pressure: 6,000 psi @ 72° F
- Maximum Vacuum: 27.4 in. of Hg @ 72° F
- Temperature Range: -40° to 250° F
- Compatible With: Parker PD-Series, Eaton/Aeroquip FD90, Faster DF
- Specifications Met: ISO 15171-1, SAE J1502
Push-to-connect sockets form a coupling when you push the plug into the socket and hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Overall Lg. | Lg. | Dia. | Pipe Size | Dash Size | Each | |
Steel | |||||||
| 1/8 | 2 1/4" | 3/16" | 1/2" | 1/4 | 04 | 0000000 | 000000 |