Flashback Arrestor 85-20. ½”NPT

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For Fuel Gases

Max. flow: 45m3/h (acetylene)

Max. flow: 375m3/h (fuel gases)

Max. Working Pressures:

Acetylene – 1.5 bar

LPG, NG, Methane, Ethylene – 5 bar

Hydrogen – 4 bar

Flame arrestor

Non-return valve

Temperature sensitive cut-off valve

Dirt filter

Item #: 1112
Quantity Available: 100

100 in stock


WITT Flashback Arrestors for reliable protection against dangerous reverse gas flow and
flashbacks according to DIN EN ISO 5175-1.

Every Arrestor 100% tested.

The best Flashback Arrestors in the world:

  • a large surface area flame arrestor FA of stainless steel construction extinguishes any dangerous flashback entering the device in any direction
  • a temperature-sensitive cut-off valve TV extinguishes sustained flashbacks long before the internal temperature of the arrestors reaches a dangerous level
  • a spring-loaded check valve NV prevents slow or sudden reverse gas flow from forming explosive mixtures in the gas supply

Operation / Usage:

  • Flashback Arrestors are used to protect gas cylinders and pipeline outlet points (hoses and any equipment) against dangerous reverse gas flow and flashbacks
  • for pipeline outlets and single cylinders with high users for example supply units for gas cutting machines
  • WITT Flashback Arrestors may be mounted in any position /orientation
  • only one piece of equipment may be connected to a single Flashback Arrestor
  • the maximum ambient / working temperature is 158 °F


  • annual testing of the non-return valve, body leak tightness and flow capacity is recommended
  • WITT is happy to supply special test equipment
  • Flashback Arrestors are only to be serviced by the manufacturer

Company certified to ISO 9001







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