Reducers for Oxygen | McMaster-Carr

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For Use With

Grinders for Bits and Burs

Handheld Power Drills

Pedestal Grinder Wheels

Pharmaceuticals

Solid Particles

Solvents

Acetic Acid (White Vinegar)

Acetic Acid (White Vinegar) (5% Concentration)

Acetic Acid (White Vinegar) (10% Concentration)

Acetic Acid (White Vinegar) (75% Concentration)

Argon/Carbon Dioxide Blend

Hydrochloric Acid (10% Concentration)

Hydrochloric Acid (25% Concentration)

Hydrochloric Acid (37% Concentration)

Liquid Carbon Dioxide

Nitric Acid (10% Concentration)

Phosphoric Acid (85% Concentration)

Salt Water (30% Concentration)

Silane

Sodium Carbonate (Soda Ash)

Sodium Carbonate (Soda Ash) (20% Concentration in Water)

Sodium Hydroxide (Caustic Soda)

Sodium Hydroxide (Caustic Soda) (50% Concentration)

Sodium Hypochlorite (Bleach)

Steam

Sulfur Hexafluoride

Sulfuric Acid

Sulfuric Acid (30% Concentration)

Sulfuric Acid (70% Concentration)

Sulfuric Acid (75% Concentration)

Sulfuric Acid (80% Concentration)

Tungsten Hexafluoride

Shape

Gender

Maximum Pressure @ Temperature

Connects To

Fitting Connection

Body Shape

Length

Hex Width

Maximum Steam Pressure @ Temperature

1,500 psi @ 300° F

Tube Material

316-316L Stainless Steel

REACH

Compliant

Not Compliant

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

2B999

EAR99

RoHS

Compliant

Compliant with Exemptions

Specifications Met

Fabrication

Tube OD

Outlet Location

Body Material

Outlet Pressure

75 Products

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.

About Gas Regulators

Precision Extreme-Pressure Brass Threaded Pipe Fittings

Also known as instrumentation fittings, these have the most precise threads and the tightest tolerances of all the brass pipe fittings we offer. Fittings are brass for good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Straight Reducing Adapters

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Female × NPT Male
1/8	1/16	3,200 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/4	1/8	4,300 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000
3/8	1/8	3,500 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/8	1/4	3,500 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000
1/2	1/4	2,400 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/2	3/8	2,400 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
3/4	1/2	3,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000

Bushing Straight Reducing Adapters

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Male × NPT Female
1/4	1/8	3,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	000000
3/8	1/8	3,200 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	0000
3/8	1/4	3,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000
1/2	1/8	3,200 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/2	1/4	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000
1/2	3/8	2,800 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000
3/4	1/2	2,800 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000

Straight Reducers, Female

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Female
1/8	1/16	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	000000
1/4	1/8	3,200 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	0000
3/8	1/4	2,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
1/2	1/4	3,600 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	0000000	00000
1/2	3/8	2,400 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000
3/4	1/2	2,300 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	00000

Straight Reducers, Male

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: See table

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Male
1/8	1/16	5,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	000000
1/4	1/8	4,100 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/8	1/8	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.3	00000000	0000
3/8	1/4	4,000 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	1/4	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
1/2	3/8	3,900 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000
3/4	1/2	3,800 psi @ 72° F	1,500 psi @ 300° F	ASME B1.20.1, ASME B31.1, ASME B31.3	00000000	00000

90° Elbow Reducing Adapters

For Use With: Air, Argon, Natural Gas, Nitrogen Gas, Oil, Oxygen, Steam, Water
Specifications Met: ASME B1.20.1, ASME B31.1, ASME B31.3

Pipe Size
(A)	(B)	Max. Pressure	Max. Steam Pressure		Each
NPT Female × NPT Male
1/8	1/4	2,900 psi @ 72° F	1,500 psi @ 300° F	00000000	000000
1/4	1/2	3,000 psi @ 72° F	1,500 psi @ 300° F	00000000	000000
3/8	1/2	2,700 psi @ 72° F	1,500 psi @ 300° F	00000000	000000

Ultra-High-Polish Gasket Fittings for Stainless Steel Tubing

For Use With: Ammonia, Argon, Butane, Carbon Dioxide, Chloride, Fluoride, Fluorocarbon, Germane, Halide, Helium, Hydrogen, Krypton, Laser Gas, Natural Gas, Neon, Nitrogen, Oxygen, Silane, Sulfur Hexafluoride, Tungsten Hexafluoride, Xenon
Temperature Range: -420° to 1000° F
Tubing: Use with 316/316L stainless steel
Compatible With: Swagelok® VCR

Polished to at least a 15 Ra finish on the inside, these fittings have an ultra-smooth interior surface that helps prevent contamination. Also known as ultra-high-purity fittings, they’re packed in a Class 100 clean room, cleaned, and double bagged. 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.

To assemble, place a gasket between the gasket ends before gently rotating the female-threaded fitting onto the male-threaded fitting. Tighten until 1/8 of a turn past finger tight.

Choose threaded fittings to attach directly to other fittings. Or, choose one of the following types of fittings to attach directly to tubing:

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow.

Yor-Lok fittings have two sleeves that bite into tubing as you tighten the nut, creating a strong steal without the need for welding. They're also known as instrumentation fittings.

Tube stem fittings connect to Yor-Lok fittings (sold separately).

For technical drawings and 3-D models, click on a part number.

Straight Reducers, Male Threaded Gasket Fitting

For Tube OD (A)	For Tube OD (B)	Material	Max. Pressure	Max. Vacuum	Interior Smoothness, Ra	Environmental Rating		Each
1/2"	1/4"	316L Stainless Steel	3,750 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	000000

Straight Reducing Adapters, Male Threaded Gasket Fitting × Yor-Lok Tube

	For Tube (Yor-Lok)
For Tube OD (Gasket)	OD	Wall Thick.	Material	Max. Pressure	Max. Vacuum	Interior Smoothness, Ra	Environmental Rating		Each
1/4"	1/8"	0.035"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	000000
1/4"	3/8"	0.035"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	00000

Straight Reducing Adapters, Unthreaded Gasket Fitting × Butt-Weld Tube

Adapters with an unthreaded gasket fitting connection are also known as glands.

For Tube OD
Gasket	Butt Weld	Wall Thick.	Lg.	Material	Max. Pressure	Max. Vacuum	Interior Smoothness, Ra	Environmental Rating		Each
1/4"	1/8"	0.028"	1 3/32"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	000000
1/4"	1/8"	0.028"	1 13/32"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	00000
1/2"	1/4"	0.035"	1 1/8"	316L Stainless Steel	3,750 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	00000
1/2"	1/4"	0.035"	1 25/32"	316L Stainless Steel	3,750 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	00000
1/2"	3/8"	0.035"	1 1/8"	316L Stainless Steel	3,750 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	00000
1/2"	3/8"	0.035"	1 25/32"	316L Stainless Steel	3,750 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	00000

Straight Reducing Adapters, Unthreaded Gasket Fitting × Tube Stem

Adapters with an unthreaded gasket fitting connection are also known as glands.

For Tube OD (Gasket)	Tube Stem OD	Wall Thick.	Material	Max. Pressure	Max. Vacuum	Interior Smoothness, Ra	Environmental Rating		Each
1/2"	3/8"	0.049"	316L Stainless Steel	3,750 psi @ 72° F	10 ^-11 torr @ 72° F	5	Fed. Std. Class 100	00000000	000000

Nuts

Male

Female

Male
For Tube OD	Nut Material	Max. Pressure	Max. Vacuum	Lg.		Each
1/4"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	17/32"	00000000	00000
1/4"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	23/32"	0000000	0000
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	13/16"	0000000	00000
Female
1/4"	316L Stainless Steel	5,100 psi @ 72° F	10 ^-11 torr @ 72° F	13/16"	0000000	0000
1/2"	316L Stainless Steel	3,500 psi @ 72° F	10 ^-11 torr @ 72° F	7/8"	0000000	00000

Gaskets

Gasket

Gasket with
Retaining
Tabs

Nickel gaskets are softer than stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. They’re reactive to carbon monoxide and ozone, so they shouldn’t be used with those chemicals.

Hard and heat resistant, stainless steel gaskets can be used in a wider range of applications than nickel gaskets such as carbon monoxide and ozone. However, they’re harder to tighten than nickel gaskets, and they’ll wear down sealing surfaces more quickly.

Silver-plated stainless steel gaskets are softer than unfinished stainless steel gaskets, so they won’t wear down sealing surfaces as much, and they’re easier to tighten. However, they oxidize when exposed to air, and silver particles might flake off during assembly.

Gaskets with retaining tabs stay in place during installation, so you don’t have to hold the gasket while fastening fittings together. This also means they’re less likely to scratch or nick your fittings by rotating during installation.

Nickel Gasket
For Tube OD	Max. Vacuum	Environmental Rating		Each
1/4"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	00000
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000
316L Stainless Steel Gasket
1/4"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	0000000	0000
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	0000000	0000
Silver-Plated 316L Stainless Steel Gasket
1/4"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000
316L Stainless Steel Gasket with Retaining Tabs
1/4"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000
1/2"	10 ^-11 torr @ 72° F	Fed. Std. Class 100	00000000	0000

Clean Room Pressure-Regulating Valves for Water, Air, and Inert Gas

For Use With: Deionized Water, Air, Nitrogen, Oxygen
Temperature Range: 41° to 140° F

To maintain contaminant-free standards in clean room environments, these valves come cleaned and bagged to Fed. Std. Class 100 and ISO Class 5 clean room standards and have a 316 stainless steel body with a smooth finish to resist dust collection. They automatically reduce a high, variable inlet pressure to a lower, stable output pressure. Adjust the outlet pressure within the range. Valves are no-bleed style, so they keep process media contained within the valve.

For technical drawings and 3-D models, click on a part number.

Inlet			Outlet
Thread Size	Location	Max. Pressure, psi	Thread Size	Location	Pressure Range, psi	End-to-End Lg.	Environmental Rating		Each
Metric Female
316 Stainless Steel Body—Fluoroelastomer Diaphragm and 316 Stainless Steel Seal
M5 × 0.8 mm	Side	150	M5 × 0.8 mm	Side	1.4 to 28	1 3/16"	Fed. Std. Class 100, ISO Class 5	00000000	0000000
M5 × 0.8 mm	Side	150	M5 × 0.8 mm	Side	7 to 99	1 3/16"	Fed. Std. Class 100, ISO Class 5	00000000	000000

Cleaned and Bagged Pressure-Regulating Valves for Air and Inert Gas

For Use With: Nitrogen, Oxygen, Argon, Helium, Neon
Temperature Range: -40° to 165° F

Often used for oxygen service and other high-purity applications, these valves are cleaned and bagged to meet CGA G-4.1 standards to prevent contamination. They automatically reduce a high, variable inlet pressure to a lower, stable outlet pressure. Adjust the outlet pressure within the range. Valves have two gauge ports. They are no-bleed style, so they keep process gases contained in the valve.

For technical drawings and 3-D models, click on a part number.

Inlet			Outlet		Gauge Port
Pipe Size	Location	Max. Pressure, psi	Pipe Size	Location	Pipe Size	Location	End-to-End Lg.	Choose an Outlet Pressure Range, psi		Each
NPT Female
Brass Body—Buna-N Diaphragm and Fluoroelastomer Seal
1/2	Side	500	1/2	Side	1/4	Side	2 13/16"	5 to 55, 40 to 110, 100 to 200, 175 to 300	00000000	0000000
3/4	Side	500	3/4	Side	1/4	Side	3 5/16"	5 to 55, 40 to 110, 100 to 200, 175 to 275	00000000	000000
1	Side	500	1	Side	1/4	Side	3 5/16"	5 to 55, 40 to 110, 100 to 200, 175 to 275	00000000	000000

Tank-Mount Pressure-Regulating Valves for Air and Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

These valves automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank.

Choose a valve with a maximum outlet pressure that’s approximately twice your application’s normal operating pressure. Your operating pressure should never exceed 75% of the valve’s maximum outlet pressure.

Single-stage valves reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank. They’re best for applications where a constant outlet pressure isn’t critical.

Two-stage valves progressively reduce pressure over two steps for more consistent outlet pressure at all times. They’re often used in applications that require a constant outlet pressure regardless of the tank level.

Valves with a brass body have a longer service life than valves with a brass and steel body.

Valves with a stainless steel diaphragm can withstand harsh environments.

Single-Stage Valves

Male Outlet × Female Inlet Single-Stage Valve With T-Handle

Male Outlet × Female Inlet Single-Stage Valve With Knob

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Oxygen
9/16"-18 UNF Male Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Left Hand	0 to 50	Knob	Brass	PTFE	Neoprene	00000000	0000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Rubber	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 145	Knob	Brass/Steel	PTFE	Rubber	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Rubber	000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 200	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000

Two-Stage Valves

Female Outlet × Female Inlet Two-Stage Valve With T-Handle

Male Outlet × Female Inlet Two-Stage Valve With T-Handle

Inlet				Outlet				Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method	Body	Seal	Diaphragm		Each
For Use With Oxygen
1/4 NPT Female Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Neoprene	0000000	0000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 250	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
9/16"-18 UNF Male Outlet × NGO Female Inlet
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Neoprene	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 50	T-Handle	Brass	PTFE	Stainless Steel	00000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass	PTFE	Stainless Steel	0000000	000000
CGA 540	Side	Right Hand	0 to 4,000	Side	Right Hand	0 to 125	T-Handle	Brass/Steel	PTFE	Rubber	000000	000000

Tank-Mount High-Pressure-Regulating Valves for Air and Inert Gas

For Use With: See Table
Temperature Range: -20° to 120° F

Often used for pressure-vessel testing and other high-pressure applications, these valves can handle at least seven times the outlet pressure of standard tank-mount pressure-regulating valves. They automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. All have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Outlet fittings are Swagelok® for a leak-free seal around hard metal tubing in high-pressure lines. Also known as instrumentation fittings, Swagelok® fittings are compatible with Parker A-Lok, Gyrolok, Bilok, and Tylok fittings. Valves have a gauge to monitor outlet pressure and a gauge to monitor inlet pressure from the tank. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

For Use With Oxygen

Female Outlet × Female Inlet Straight With Knob

Inlet					Outlet					Material
CGA Number	Location	Thread Direction	Pressure Gauge Range, psi	Stage	For Tube OD	Location	Pressure Range, psi	Pressure Adjustment Method	Shape	Body	Seal	Diaphragm		Each
NGO Female Inlet × Swagelok® Female Outlet
CGA 540	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 1,500	Knob	Straight	Brass	PCTFE	Neoprene	0000000	0000000
CGA 540	Side	Right Hand	0 to 4,000	Single	1/4"	Side	0 to 2,500	Knob	Straight	Brass	PCTFE	Neoprene	0000000	000000

Tank-Mount Pressure-Regulating Valves for Cryogenic Cylinders

For Use With: See Table
Temperature Range: -20° to 120° F

Automatically reduce a high inlet pressure from compressed gas tanks to a lower, stable outlet pressure. These valves can remove gases from liquid cryogenic cylinders. They have Compressed Gas Association (CGA) numbered inlet fittings for secure connections to compressed gas tanks. Choose a valve with the same CGA number as your tank and other system components. Valves come with a gauge to monitor outlet pressure. They are single stage and reduce pressure in one step, which causes the outlet pressure to fluctuate slightly as you empty the tank.

	Inlet				Outlet
For Use With	CGA Number	Location	Thread Direction	Stage	Thread Size	Location	Thread Direction	Pressure Range, psi	Pressure Adjustment Method		Each
UNF Male Outlet × NGO Female Inlet
Brass Body—Stainless Steel Diaphragm and PTFE Seal
Oxygen	CGA 540	Side	Right Hand	Single	9/16"-18	Bottom	Right Hand	0 to 125	T-Handle	0000000	0000000