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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Argon, Nitrogen, and Oxygen Hose with Male and Female Threaded Fittings
- Temperature Range: -65° to 450° F
- Maximum Vacuum: 28" of Hg @ 72° F
- Material: PTFE with 304 Stainless Steel Cover
This hose is often called pigtail hose. It comes cleaned, capped, and bagged to meet CGA (Compressed Gas Association) G4.1. Hose should not be used underground.
For technical drawings and 3-D models, click on a part number.
Argon, Nitrogen, and Oxygen Hose with Female Threaded Fittings
- Temperature Range: -65° to 450° F
- Maximum Vacuum: 28" of Hg @ 72° F
- Material: PTFE with 304 Stainless Steel Cover
This hose is often called pigtail hose. It comes cleaned, capped, and bagged to meet CGA (Compressed Gas Association) G4.1. Hose should not be used underground.
For technical drawings and 3-D models, click on a part number.
High-Temperature Argon, Nitrogen, and Oxygen Hose
- Temperature Range: -320° to 1,500° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 316 Stainless Steel with 304 Stainless Steel Cover
Transfer industrial gases in temperatures up to 1500° F. The braided reinforcement provides good flexibility in high-vibration applications. A cover surrounds the braid to protect it from damage. Hose comes cleaned, capped, and bagged to meet CGA (Compressed Gas Association) G4.1. It should not be used underground.
For technical drawings and 3-D models, click on a part number.
Liquid Nitrogen Hose with Threaded Fittings
- Temperature Range: -320° to 1,500° F
- Maximum Vacuum: 29" of Hg @ 72° F
- Material: 321 Stainless Steel with 304 Stainless Steel Braid
- Female Fittings Swivel Until Tightened
Transfer liquid nitrogen across a wide temperature range with this hose. Hose comes cleaned, capped, and bagged to meet CGA (Compressed Gas Association) G4.1. The braid provides good flexibility in high-vibration applications. Female fittings swivel until tightened for easy installation.
Hose with Cover—A cover surrounds the braid to protect it from damage.
| Pipe Size  | Thread Size | ID | OD | Bend Radius | Max. Pressure | 1 1/2 ft. | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 10 ft. | 12 ft. | |
304 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | 3/4"-16 | 1/2" | 13/16" | 4 7/8" | 1,160 psi @ 72° F | 00000000 | |||||||
316 Stainless Steel 45° Flared UNF Female × 316 Stainless Steel 45° Flared UNF Female | |||||||||||||
| __ | 3/4"-16 × 3/4"-16 | 1/2" | 13/16" | 4 7/8" | 1,160 psi @ 72° F | 00000000 | |||||||
316 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | |||||||||||||
| 1/2 | 3/4"-16 | 1/2" | 13/16" | 4 7/8" | 1,160 psi @ 72° F | 00000000 | |||||||
| Pipe Size | Thread Size | ID | OD | Bend Radius | Max. Pressure | Cover Material | 1 1/2 ft. | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 10 ft. | 12 ft. | |
304 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 3/8 | 3/4"-16 | 1/2" | 15/16" | 4 7/8" | 1,160 psi @ 72° F | 304 Stainless Steel | 00000000 | |||||||
316 Stainless Steel 45° Flared UNF Female × 316 Stainless Steel 45° Flared UNF Female | ||||||||||||||
| __ | 3/4"-16 × 3/4"-16 | 1/2" | 15/16" | 4 7/8" | 1,160 psi @ 72° F | 304 Stainless Steel | 00000000 | |||||||
316 Stainless Steel NPT Male × 316 Stainless Steel 45° Flared UNF Female | ||||||||||||||
| 1/2 | 3/4"-16 | 1/2" | 15/16" | 4 7/8" | 1,160 psi @ 72° F | 304 Stainless Steel | 00000000 | |||||||
Threaded Hose Fittings for Compressed Gas
Use these fittings to connect welding hose to pressure regulators and torches. They are also known as CGA (Compressed Gas Association) fittings. Fittings are brass for good corrosion resistance.
Wye adapters allow you to connect two hoses from a single pressure-regulator outlet.
Fittings with left-hand threads are identified with a notch in the nut.
Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 032 x 022 | B | 5/8"-18 x 9/16"-18 | UN/UNF (CGA) | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Xenon | 0000000 | 000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Hose Connection | Female Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | 1/4 | NPT | Right Hand | Oxygen | 000000 | 000000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000 | 00000 |
| 032 | B | 5/8"-18 | UN/UNF (CGA) | Right Hand | 1/4 | NPT | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 00000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Hose Connection | Male Hose Connection | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||||
| 020 | A | 3/8"-24 | UN/UNF (CGA) | Right Hand | 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 0000000 | 000000 |
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 00000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | 020 | A | 3/8"-24 | UN/UNF (CGA) | Right Hand | Oxygen | 0000000 | 00000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 00000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Hose Connection | Male Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | 1/4 | NPT | Right Hand | Oxygen | 0000000 | 000000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 00000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Female Pipe Connection | Male Hose Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Type | Thread Direction | CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 1/4 | NPT | Right Hand | 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 0000000 | 000000 |
| 1/4 | NPT | Right Hand | 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 00000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 032 x 022 | B | 5/8"-18 x 9/16"-18 | UN/UNF (CGA) | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Oxygen, Xenon | 0000000 | 000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Male Hose Connection | Male Pipe Connection | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | Pipe Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 020 | A | 3/8"-24 | UN/UNF (CGA) | Right Hand | 1/4 | NPT | Right Hand | Oxygen | 000000000 | 00000 |
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | 1/8 | NPT | Right Hand | Oxygen | 000000000 | 0000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | 1/4 | NPT | Right Hand | Oxygen | 0000000 | 0000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | 3/8 | NPT | Right Hand | Oxygen | 000000000 | 0000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/8 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1/4 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 0000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | 3/8 | NPT | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
| 032 | B | 5/8"-18 | UN/UNF (CGA) | Right Hand | 1/4 | NPT | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 00000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000 | 00000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 000000 | 0000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000 | 0000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 032 | B | 5/8"-18 | UN/UNF (CGA) | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 0000000 | 000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
Nuts for Barbed Hose Fittings for Compressed Gas
Also known as CGA (Compressed Gas Association) nuts, these are designed for low-pressure welding applications downstream of your tank and pressure regulator. Slide a barbed hose adapter for compressed gas into a male or female nut to make a threaded connection to torches or pressure regulators.
Nuts with left-hand threads are identified with a notch.
Brass nuts have good corrosion resistance. Stainless steel nuts have excellent corrosion resistance.
Note: Nuts have a CGA number that corresponds to a specific type of gas. Choose a nut with the same CGA number as your tank and other system components.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 020 | A | 3/8"-24 | UN/UNF (CGA) | Right Hand | Oxygen | 0000000 | 00000 |
| 021 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 000 |
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 000000 | 000 |
| 023 | B | 9/16"-18 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000 | 000 |
| 024 | C | 7/8"-14 | UN/UNF (CGA) | Right Hand | Oxygen | 000000000 | 0000 |
| 025 | C | 7/8"-14 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 0000 |
| 026 | D | 1 1/4"-12 | UN/UNF (CGA) | Right Hand | Oxygen | 000000000 | 00000 |
| 027 | D | 1 1/4"-12 | UN/UNF (CGA) | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 000000000 | 00000 |
316 Stainless Steel | |||||||
| 022 | B | 9/16"-18 | UN/UNF (CGA) | Right Hand | Oxygen | 000000000 | 00000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
| CGA Number | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | |||||||
|---|---|---|---|---|---|---|---|
| 030 | A | 3/8"-24 | UN/UNF (CGA) | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 000000000 | 00000 |
| 031 | A | 3/8"-24 | UN/UNF (CGA) | Left Hand | Air, Water | 000000000 | 0000 |
| 032 | B | 5/8"-18 | UN/UNF (CGA) | Right Hand | Argon, Helium, Krypton, Neon, Nitrogen, Xenon | 0000000 | 0000 |
| 033 | B | 5/8"-18 | UN/UNF (CGA) | Left Hand | Air, Water | 0000000 | 0000 |
| 035 | C | 7/8"-14 | UN/UNF (CGA) | Left Hand | Air, Water | 000000000 | 00000 |
Threaded Hose-to-Propane-Tank Adapters for Compressed Gas
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
These adapters have a male threaded end that connects to a propane tank and a male threaded end that connects to a hose. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance. Fittings have left-hand threads that are identified with a notch in the nut.
Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.
CGA Number | Hose Connection | Tank Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hose | Tank | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 023 | 510 | 9/16"-18 | UN/UNF (CGA) | Left Hand | 0.880"-14 | NGO | Left Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |
Threaded Hose-to-Propane-Torch Adapters for Compressed Gas
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
These adapters allow you to connect a hose to a propane torch. Fittings are also known as CGA (Compressed Gas Association) fittings. They are brass for good corrosion resistance. Fittings have left-hand threads that are identified with a notch in the nut.
Note: Fittings have a CGA number that corresponds to a specific type of gas. Choose a fitting with the same CGA number as your tank and other system components.
CGA Number | Hose Connection | Torch Connection | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Hose | Torch | Thread Size | Thread Type | Thread Direction | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
Brass | ||||||||||
| 023 | 600 | 9/16"-18 | UN/UNF (CGA) | Left Hand | 1"-20 | UN/UNF (CGA) | Right Hand | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Propane | 0000000 | 000000 |
Quick-Disconnect Hose Couplings for Compressed Gas
Use these couplings to quickly link and unlink welding hoses, torches, and pressure regulators. They consist of a plug and socket that are sold together as a set of two—you’ll get one right-hand connection for oxygen and one left-hand connection for fuel gas. The connections are noninterchangeable and color coded so you can’t mix lines. The male threaded ends attach to threaded welding hose, and the female threaded ends attach to a torch or pressure regulator. To connect couplings, push the plug into the socket; the sleeve on the socket has a spring-loaded lock for gas-tight connections. To disconnect, pull back on the socket sleeve and twist to release the plug. The sockets have a shut-off valve that stops the flow when the coupling is separated so gas won’t leak from the line. The sockets also have a built-in check valve to prevent gas backflow. Couplings are also known as CGA (Compressed Gas Association) couplings. They are brass for good corrosion resistance.
Couplings with left-hand threads are identified with a notch in the nut.
Note: Couplings have a CGA number that corresponds to a specific type of gas. Make sure the CGA number of the coupling matches the CGA number of your tank and other system components.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed
| Includes | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
| One CGA 022 Coupling Adapter (Male Hose Plug × Female Torch Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Torch Socket) | B | 9/16"-18 | UN/UNF (CGA) | Right Hand (CGA 022), Left Hand (CGA 023) | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed
| Includes | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
| One CGA 022 Coupling Adapter (Male Hose Plug × Female Regulator Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Female Regulator Socket) | B | 9/16"-18 | UN/UNF (CGA) | Right Hand (CGA 022), Left Hand (CGA 023) | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000000 |
- Maximum Pressure: 200 psi @ 72° F
- Maximum Temperature: 120° F
- Specifications Met: OSHA 29 CFR 1915.55, OSHA 29 CFR 1917.152, OSHA 29 CFR 1926.350, UL Listed
| Includes | Gas Fitting Size | Thread Size | Thread Type | Thread Direction | For Use With | Each | |
| One CGA 022 Coupling Adapter (Male Hose Plug × Male Hose Socket) One CGA 023 Coupling Adapter (Male Hose Plug × Male Hose Socket) | B | 9/16"-18 | UN/UNF (CGA) | Right Hand (CGA 022), Left Hand (CGA 023) | Acetylene, Butane, Fuel Gases, LP Gas, Natural Gas, Oxygen, Propane | 000000 | 0000000 |
Nuts for High-Pressure Nipples for Compressed Gas
Slide a high-pressure hose nipple for compressed gas into one of these nuts to connect a pipe to the inlet of a pressure regulator. They are also known as CGA (Compressed Gas Association) nuts and inlet nuts.
Brass nuts have good corrosion resistance and are softer than 316 stainless steel nuts, so they're easier to thread together. Aluminum-plated brass nuts have better corrosion and wear resistance than unplated brass.
Nuts with a plastic grip can be tightened by hand instead of with a wrench.
Nuts with left-hand threads are identified with a notch.
Note: Nuts have a CGA, BS, or DIN number that corresponds to a specific type of gas. Choose a nut with the same number as your tank and other system components.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 9: 250° F
| Number | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Aluminum-Plated Brass | |||||||
|---|---|---|---|---|---|---|---|
| CGA 170 | 9/16"-18 | UN/UNF (CGA) | Right Hand | 3,000 psi @ 72° F | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 000000 |
| CGA 180 | 5/8"-18 | UN/UNF (CGA) | Right Hand | 3,000 psi @ 72° F | Air, Argon, Butane, Carbon Dioxide, Helium, Krypton, Methane, Natural Gas, Neon, Nitrogen, Oxygen, Propane, Propylene | 000000000 | 00000 |
- Maximum Pressure: See table
- Maximum Temperature: 120° F, except DIN 477 No. 12: 250° F
| Number | Thread Size | Thread Type | Thread Direction | Max. Pressure | For Use With | Each | |
Brass with Plastic Grip | |||||||
|---|---|---|---|---|---|---|---|
| CGA 590 | 0.960"-14 | UN/UNF (CGA) | Left Hand | 3,000 psi @ 72° F | Sulfur Hexafluoride | 00000000 | 000000 |