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Brass gas regulator with chrome finish, T-handle control, dual gauges, CGA 320 inlet, 2.75 inch body

Harris

Harris 425 Series Gas Regulator 0 to 125 psi, 2.75", Carbon Dioxide

SKU CH-ZMRC-7JD6W

Single-stage cylinder regulator delivers 0 to 125 psig outlet pressure for carbon dioxide with CGA 320 inlet and 9/16-18 UNF outlet

  • MaterialHAWA
  • TypeSingle Stage Cylinder
  • Single-stage design gives steady CO₂ flow
  • 0–125 psi outlet range suits many tasks
  • CGA-320 inlet fits standard CO₂ cylinders
  • Chrome-plated brass body resists corrosion
  • Neoprene diaphragm handles industrial use

Harris 425 Series CO₂ Regulator

The Harris 425 Series regulator is a single-stage cylinder device designed for carbon dioxide supply in industrial welding applications. It delivers outlet pressures from 0 to 125 psig through a chrome-plated brass body with a neoprene diaphragm. The unit carries CGA 320 certification for CO₂ service and features a 2.75 inch gauge for pressure monitoring.

Installation uses NGO male inlet and UNF male outlet

The regulator connects via a 0.825-14 NGO male inlet thread and a 9/16-18 UNF male outlet thread, both tightened with standard wrenches. A T-handle control adjusts outlet pressure without tools. The single-stage design means outlet pressure will rise as cylinder pressure drops, so operators must re-check settings during long runs. California Proposition 65 warnings apply to materials in this product.

Suited for fixed-pressure CO₂ welding stations

This regulator fits workshops running carbon dioxide shielding gas at steady pressures up to 125 psig where single-stage performance is acceptable. It is not for buyers who need constant outlet pressure regardless of cylinder level, systems requiring a different CGA inlet, or installations that demand a female outlet connection.

Highlights

  • Single-stage design gives steady CO₂ flow
  • 0–125 psi outlet range suits many tasks
  • CGA-320 inlet fits standard CO₂ cylinders
  • Chrome-plated brass body resists corrosion
  • Neoprene diaphragm handles industrial use

Specifications

BrandHarris
MaterialHAWA
TypeSingle Stage Cylinder

Questions about this item

How do I verify the regulator is delivering the correct 125 psig outlet pressure after installation?

Connect the regulator to a CO₂ cylinder using the CGA 320 inlet, open the cylinder valve slowly, then read the outlet gauge; the needle should stabilise at or below 125 psig.

What comes with the regulator and which fittings must I supply?

The unit includes the single-stage brass body with chrome finish, neoprene diaphragm, T-handle control and CGA 320 male inlet; you must provide a compatible CO₂ cylinder and a 9/16"-18 UNF male outlet hose or fitting.

Which version should I choose for a standard industrial CO₂ cylinder?

Select this 425 Series model with CGA 320 inlet, 0.825"-14 NGO male thread and 125 psig maximum outlet — it matches common industrial CO₂ cylinders.

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