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Pair of brass flashback arrestors with 9/16-18 UNF fittings for oxygen and fuel regulators

Miller-Smith Equipment

Miller-Smith Equipment H753 Flashback Arrestor Set Regulator Oxy/Fuel

SKU CH-NQM7-09KHS

Flashback arrestor set for regulator mounting handles fuel and oxygen with 9/16 in.-18 UNF connections and UL listing

  • TypeWelding Parts & Supplies
  • Regulator-mounted arrestors stop reverse flow at the source
  • UL Listed brass body meets recognised safety standards
  • Dual-gas compatibility handles both oxygen and fuel lines
  • 9/16 in.-18 UNF fittings match standard B-size hose connections
  • High oxygen capacity of 1,700 scfh supports heavy cutting work

Flashback Arrestor Set H753

The Miller-Smith Equipment H753 is a flashback arrestor set designed for oxy/fuel welding systems. It mounts at the regulator and accepts both oxygen and fuel gases. The brass body provides corrosion resistance for workshop use. UL listing confirms compliance with recognised safety standards.

Regulator mount with 9/16-18 UNF connections

Inlet and outlet connections are 9/16 in. -18 UNF threads with CGA 022 for oxygen and CGA 023 for fuel. Maximum flow rates are 1,700 scfh for oxygen and 175 scfh for fuel. Hose fitting size B matches standard welding hose assemblies. These specifications determine fit with existing regulator and hose equipment.

Suits welders adding flashback protection

Buyers who need torch-end arrestors instead of regulator-mount units should look elsewhere. Systems requiring different CGA inlet numbers or larger flow capacities are not compatible. The set is restricted from sale in certain states, so local availability must be verified before purchase.

Highlights

  • Regulator-mounted arrestors stop reverse flow at the source
  • UL Listed brass body meets recognised safety standards
  • Dual-gas compatibility handles both oxygen and fuel lines
  • 9/16 in.-18 UNF fittings match standard B-size hose connections
  • High oxygen capacity of 1,700 scfh supports heavy cutting work

Specifications

TypeWelding Parts & Supplies
BrandSMITH EQUIPMENT

Questions about this item

What does the 175 scfh fuel flow rating mean when the arrestor is installed on a regulator?

It limits fuel gas to 175 standard cubic feet per hour, protecting the regulator from reverse flow and flashback at that maximum rate.

How do the CGA 022 and CGA 023 inlet connections affect what hoses can be used?

CGA 022 fits oxygen regulators and CGA 023 fits fuel-gas regulators; both use 9/16 in.-18 UNF threads, so only hoses with matching B-size fittings will connect.

What mounting space is needed for the brass body with 9/16 in.-18 UNF inlet and outlet?

The arrestor mounts directly on the regulator using the 9/16 in.-18 UNF connections, requiring only the clearance of the brass body itself between regulator and hose.

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