Harris
Harris 425 Series Gas Regulator 0 to 15 psi 2.75" Acetylene
Single-stage acetylene regulator delivers up to 15 psi outlet pressure through a 2.75-inch chrome-plated brass body with neoprene diaphragm
- MaterialHAWA
- TypeSingle Stage Cylinder, Heavy Duty
- Precise low-pressure delivery up to 15 psig for acetylene welding
- Single-stage heavy-duty brass body with chrome-plated finish resists corrosion
- CGA 300 inlet connection fits standard acetylene cylinders securely
- T-handle control allows smooth outlet pressure adjustment
- Neoprene diaphragm maintains consistent flow during industrial use
Harris 425 Acetylene Regulator
This Harris 425 Series regulator controls acetylene flow for industrial welding and cutting tasks. It delivers outlet pressure up to 15 psig from a single-stage brass body with chrome plating. The unit uses a CGA 300 inlet connection and a 9/16-18 UNF male outlet. A neoprene diaphragm and T-handle provide adjustment control.
Upgrade from preset or light-duty units
This regulator replaces fixed-pressure or lower-capacity models when variable outlet control up to 15 psig is required. The jump is worth it for operators who need consistent acetylene delivery across changing cylinder pressures. Single-stage construction suits applications where inlet pressure remains relatively stable. It is not for users needing two-stage precision or compatibility with fuel gases other than acetylene.
Installation and common issues
Connect the male CGA 300 nut to the cylinder valve using a suitable wrench on the 0.825-14 thread. Attach the hose to the 9/16-18 UNF male outlet fitting. Leaks typically arise from damaged inlet seats, worn neoprene diaphragms, or loose outlet connections. The chrome-plated brass body resists corrosion but requires clean threads to seal properly. California Proposition 65 warnings apply to this product.
Highlights
- Precise low-pressure delivery up to 15 psig for acetylene welding
- Single-stage heavy-duty brass body with chrome-plated finish resists corrosion
- CGA 300 inlet connection fits standard acetylene cylinders securely
- T-handle control allows smooth outlet pressure adjustment
- Neoprene diaphragm maintains consistent flow during industrial use
Specifications
| Brand | Harris |
|---|---|
| Material | HAWA |
| Type | Single Stage Cylinder, Heavy Duty |
Questions about this item
What cylinder inlet thread does the 425 Series regulator require for acetylene?
It uses a CGA 300 male inlet with 0.825 in.-14 NGO threads that screw directly onto the acetylene cylinder valve.
Which step is most often missed when installing this single-stage regulator?
After threading the CGA 300 nut onto the cylinder, back the T-handle fully counter-clockwise before opening the cylinder valve so the diaphragm seats without pressure surge.
When should the neoprene diaphragm be inspected or replaced on this acetylene regulator?
Check the neoprene diaphragm at each cylinder change; replace it if you see cracking, permanent set, or if outlet pressure creeps above the 15 psig setting.
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