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Brass oxygen regulator with chrome finish and T-handle control

Harris

Harris 425 Series Oxygen Regulator 0 to 200 psi 2.75

SKU CH-RFG4-A8SEF

Single-stage oxygen regulator delivers 0–200 psi through a CGA 540 inlet with chrome-plated brass body

  • Product typeSingle Stage Cylinder
  • Precise oxygen delivery up to 200 psig
  • Single-stage cylinder design simplifies pressure control
  • CGA 540 inlet ensures secure tank connection
  • 9/16 in.-18 UNF outlet fits standard welding hoses
  • Chrome-plated brass body resists corrosion in industrial use

Harris 425 Series Oxygen Regulator

The Harris 425 Series is a single-stage cylinder regulator built for oxygen service in industrial welding and cutting applications. It delivers a maximum outlet pressure of 200 psig through a CGA 540 inlet connection and a 9/16 in.-18 UNF male outlet. The brass body features a chrome-plated finish and a neoprene diaphragm for reliable operation. A T-handle provides direct control over the output pressure.

Replaces worn or undersized oxygen regulators

This unit replaces an existing single-stage regulator that no longer holds a steady 0 to 200 psig range or that shows gauge drift under load. The jump is worth it when the current regulator cannot maintain consistent flow for the torch tip sizes in use, when the inlet connection threads are damaged, or when the diaphragm material has deteriorated and risks contamination. The 2.75 in. gauge face allows clear reading of the working pressure at a glance.

Suits welders and fabricators running oxygen

It suits operators who need a new, brass-bodied regulator with a chrome finish for general-purpose industrial oxygen supply. Buyers who require a two-stage design for ultra-stable pressure at very low flow rates should look elsewhere. Those needing a regulator for fuel gases such as acetylene or propane, or for cylinder connections other than CGA 540, must select a different model. The product carries California Proposition 65 warnings for cancer and reproductive harm.

How it compares

Measured against everything we stock in Welding Equipment & Positioners, at today’s prices. Recalculated every night.

Price $199.99
Pricier than about 80% of the 1,978 comparable items (median $50.99).

Specifications

Product
Brand nameHarris
Product typeSingle Stage Cylinder

Questions about this item

Will the CGA 540 inlet with 0.825 In. -14 thread fit my oxygen cylinder valve?

Yes, the CGA 540 male inlet with 0.825 In. -14 thread is the standard connection for high-pressure oxygen cylinders in industrial service.

How do I set the outlet pressure using the T-handle without damaging the neoprene diaphragm?

Close the cylinder valve, open the regulator T-handle fully counter-clockwise, then slowly open the cylinder valve before turning the T-handle clockwise to the desired outlet pressure up to 200 psig.

When should I replace the neoprene diaphragm or the 9/16 In. -18 UNF outlet fitting?

Replace the diaphragm if outlet pressure creeps above the set point or if gas leaks from the bonnet vent; replace the outlet fitting if the threads are damaged or the seal face shows scoring.

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