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Stainless Steel Flash Arrestor
Series 8492-P4FM


The model 8492 is an ideal choice where stainless steel is desired as the material of construction. It my be used on flammable gases other than those approved by UL providing the materials of construction are compatible. When installed in a line containing a flammable gas these units will prevent reverse flow, stop, and extinguish a flashback. The unit shuts off the flow of gas in the event of a flashback or reverse flow in excess of 7 psig. Re-setting is automatic when the down stream pressure is relieved. There is no need to open the gas line and no disassembly or special tools are required.


  • UL listed for:
    Acetylene @15.0 psig
    Hydrogen/air @ 50.0 psig
    LPG @50.0 psig
    Oxygen @143.0 psig.
  • May be used on compatible corrosive flammable gases.
  • Reusable – can be reused after a flashback without opening the system or removing from service.
  • Stainless steel flame barrier positively extinguishes flame within the housing.
  • Checks reverse flow and provides positive shut-off of reverse flow over 7 psig.
  • Thermal cut-off.
  • Built-in 100 micron filter on inlet.
  • High flow capacity.

Materials of Construction

Body: 316L stainless steel
Internals: stainless steel
Flame barrier: stainless steel
Elastomers: Neoprene

Working Pressure

Gas Pressure psig
Acetylene 15.0 22.0
Hydrogen/oxygen 50.0 58.0
Hydrogen/air 150.0 -
Methane/LPG 50.0 72.0
Oxygen 143.0 217.0
Stainless Steel Flash Arrestor Model 8492-P4FM

Flashback Approvals

  • UL
  • ISO 5175. BS 6158
  • EN 730 (BAM/DN)
  • AS 4603

Flow Performance

Inlet Press. psigAir Flow SCFH
7.3 231.0
14.5 465.0
21.8 725.0
36.3 1041.0
2.5 1933.0

How To Order

Model Gas Service Connections
  Inlet Outlet
8492-P4FM-F flammables 1/4" NPT female 1/4" NPT male
8492-P4FM-O oxidizers 1/4" NPT female 1/4" NPT male