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Harris 301 flow gauge regulator brass body dual gauges cylinder mount

Harris

Harris 301 Series Flow Gauge Regulator Carbon Dioxide 0-4000 psi

SKU CH-MFPE-MQKQ2

Regulates carbon dioxide flow from cylinders up to 4000 psig with a 60 scfh maximum delivery rate

  • Main materialHAWA
  • Product typeFlow Gauge
  • Harris 301 Series flow gauge regulator for precise CO₂ control
  • Single-stage design delivers up to 60 scfh carbon dioxide flow
  • 825-14 NGO female inlet connects directly to standard CO₂ cylinders
  • 5/8-18 UNF female outlet provides secure hose attachment
  • 4000 psig maximum outlet pressure handles demanding welding applications

Harris 301 Series Flow Gauge Regulator

The Harris 301 Series Flow Gauge Regulator is designed for carbon dioxide shielding gas in welding applications. It mounts directly to a cylinder and provides a regulated outlet pressure up to 4000 psig. The single-stage construction delivers consistent flow for MIG and TIG processes.

Check cylinder valve and hose compatibility

Verify the cylinder valve uses a female 0.825-14 NGO right-hand inlet thread before ordering. The outlet requires a female 5/8-18 UNF connection for the hose or torch fitting. Ensure your gas supply is carbon dioxide and that the required flow rate does not exceed 60 scfh.

Replaces worn single-stage CO2 regulators

This unit replaces a damaged or out-of-calibration single-stage carbon dioxide flow gauge regulator. The upgrade is worthwhile when the existing regulator shows pressure creep, inaccurate flow indication, or thread damage on the inlet or outlet connections.

How it compares

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

Price $145.99
Pricier than about 72% of the 1,978 comparable items (median $50.99).

Specifications

Product
Brand nameHarris
Product typeFlow Gauge
Size & build
Main materialHAWA

Questions about this item

What comes in the box with the Harris 301 flow gauge regulator and what must be purchased separately?

The regulator itself is supplied new; a carbon dioxide cylinder with a 0.825‑14 NGO female inlet and any downstream hose or torch with a 5/8‑18 UNF female outlet are not included.

How do I choose the right version of this regulator for my carbon dioxide setup?

This is a single‑stage 301 series flow gauge rated for 0‑4000 psig outlet pressure and a maximum 60 scfh CO₂ flow; select it when those figures match your cylinder and process requirements.

What does the 4000 psig outlet pressure mean when the regulator is installed on a cylinder?

It indicates the maximum delivery pressure the gauge can show; actual working pressure will be set lower, up to 60 scfh flow, depending on the cylinder supply and downstream equipment.

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