Harris GP403 Economy Line Regulator
The Harris GP403 is a single-stage brass line regulator with a neoprene diaphragm for general purpose use. It provides a constant pressure at the point of use when the supply-line pressure does not vary. Harris rates it for non-corrosive gases up to grade 4.0 (99.99%); it is not recommended for high purity work that is sensitive to contamination from elastomeric parts. For high purity lines, see the HP703 or HP723C. See all models in our Line Regulators.
Specifications
- Single-stage pipeline (line) regulator
- Body and fittings: brass; bonnet: painted die cast
- Neoprene diaphragm for greater sensitivity
- PTFE seat; one-piece encapsulated seat protected by a 10 micron nickel-plated sintered bronze filter
- Tamper-proof, self-reseating internal safety relief valve
- 2″ dual-scale brass delivery gauge
- Delivery ranges: 0-15, 0-50, 0-125 or 0-250 psig
- Inlet and outlet: 1/4″ FNPT ports
- Flow coefficient Cv 0.17; pressure regulation 1.8 psig per 100 psig change in inlet pressure
- Weight 2.92 lb
- Conforms to CGA E-4 standard for gas pressure regulators
- Back panel mountable
Typical applications
- Non-corrosive industrial grade gases
- Purging and blanketing
- Pressure testing
Options
Harris also builds the GP403 with a 1/4″ MNPT nipple outlet, 1/4″ MNPT needle valve, 1/4″ FNPT diaphragm valve, 1/4″ or 1/8″ tube fittings, hose barbs, a 1/4″ MNPT, tube fitting or hose barb inlet, or no gauge. A wall mounting bracket (Harris P/N 9101242) is available. Contact us for a quote on any configuration.
Not sure this is the right regulator? Read our Regulator Buying Guide or call 1-888-641-2267 and our team will match the regulator to your application.


