Flame Arresters | McMaster-Carr

	For Use With For Use With

Propane

Butane

Natural Gas

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

UNF

	Connection Type Connection Type


Pipe	Hose

	Material Material

Brass

Aluminum

Iron

	Gender Gender

Female

Male

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Thread Direction Thread Direction

Left Hand

Right Hand

	End-to-End Length End-to-End Length

3 3/4"

4 3/4"

	Specifications Met Specifications Met

European Safety
Specification EN730

ISO

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14 Products

About Backflow-Prevention Valves

For Use With: Butane, Natural Gas, Propane
Flame-Arresting Element Material: 316 Stainless Steel

To prevent flashback in flammable gas pipelines, an internal flame-arresting element absorbs the heat from a fire to extinguish the flame. These valves are commonly used in pilot lines connected to waste gas burners.

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

Aluminum Body
Pipe Size	Max. Pressure	Max. Temperature, °F	End-to-End Lg.		Each
NPT Female
1/4	25 psi @ 176° F	176°	3"	0000000	0000000
1/2	25 psi @ 176° F	176°	3 3/4"	0000000	000000
3/4	25 psi @ 176° F	176°	3 3/4"	0000000	000000
1	25 psi @ 176° F	176°	3 3/4"	0000000	000000
1 1/2	25 psi @ 176° F	176°	3 3/4"	0000000	000000
2	25 psi @ 176° F	176°	4 3/4"	0000000	000000

Welding Gas Flashback Arresters for Torches

These arresters attach directly to torches that cut steel up to 8" thick. They extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.

Arresters with right-hand threads are for use with oxygen; arresters with left-hand threads are for use with acetylene, hydrogen, and propane.

With Right-Hand Threads

	Male Hose Connection		Female Hose Connection
Max. Pressure for Oxygen, psi	Thread Size	Thread Type	Thread Size	Thread Type	Material	Specifications Met		Each
143	9/16"-18	UNF	9/16"-18	UNF	Brass	European Safety Specification EN730, ISO 5175 Class 1	00000000	000000

With Left-Hand Threads

Max. Pressure, psi			Male Hose Connection		Female Hose Connection
Acetylene	Hydrogen	Propane	Thread Size	Thread Type	Thread Size	Thread Type	Material	Specifications Met		Each
15	50	50	9/16"-18	UNF	9/16"-18	UNF	Brass	European Safety Specification EN730, ISO 5175 Class 1	00000000	000000

With Right-Hand and Left-Hand Threads

Max. Pressure, psi				Male Hose Connection		Female Hose Connection
Oxygen	Acetylene	Hydrogen	Propane	Thread Size	Thread Type	Thread Size	Thread Type	Material	Specifications Met		Pair
143	15	50	50	9/16"-18	UNF	9/16"-18	UNF	Brass	European Safety Specification EN730, ISO 5175 Class 1	00000000	000000

Welding Gas Flashback Arresters for Regulators

Attach these arresters to the outlet connection of a regulator on a torch that cuts steel up to 11" thick. Arresters extinguish flames and have a check valve to stop reverse gas flow. They are reusable; resetting is not required after flashback.