
Tech Master GPS420 Inert Gas Regulator 250 Bar 1/4" NPT Female Outlet
- Single-stage piston cylinder regulator for inert gases up to 99.995% purity
- Maximum inlet pressure 300 bar, delivery pressure range 0-250 bar
- 1/4″ NPT Female outlet, BS 341 No.3 base entry inlet connection
- Brass body with 10 micron 316L stainless steel filter, weighs 1.5 kg
- Operating temperature range -20°C to +60°C

The Tech Master Inert Gas Regulator is a high-quality single-stage piston cylinder regulator designed for controlling non-corrosive or toxic, technical grade inert gases up to 4.5 purity (99.995%).
This regulator is ideal for applications where slight pressure variation from decreasing cylinder pressure is acceptable. It is specifically constructed for primary pressure gas control and is a product of the Gas Arc brand.
Key Features
- Five-Port Configuration: Offers extensive connection flexibility for various system needs.
- Front and Rear Panel Mounting Capabilities: Enables flexible and secure installation in different environments.
- Encapsulated Seat Design & Low Wetted Surface Area: Minimizes the risk of gas contamination, essential for maintaining gas purity.
- Full Range of Inlet and Outlet Fittings: Ensures compatibility with diverse gas types and connections.
- Base and Side Entry Points: Provides versatility in installation and connection configurations.
Typical Applications
- Industrial Processes: Suitable for applications requiring precise control of inert gases.
- Laboratories: Ideal for research settings where accurate gas flow control is necessary.
- Technical Gas Handling: Appropriate for technical grade inert gases.
| Model Number | GPS421-04-13-01-01-009-00-A |
| Brand | Gas Arc |
| Gas Type | Non-corrosive or toxic, technical grade inert gases up to 4.5 purity (99.995%) |
| Options | Options A |
| Maximum Inlet Pressure | 300 bar (4350 PSI)* |
| Inlet Connection | <=300 Bar BS 341 No.3 (Base Entry) |
| Delivery Pressure Range | 0-250 bar (0-3630 PSI) |
| Outlet Connection | 1/4″ NPT Female |
| Flow Coefficient (Cv) | 0.1 |
| Weight | 1.5 kg (3.3 lbs)** |
| Gauges Diameter | 50mm (2 inches) |
| Temperature Range | -20°C to +60°C (-4°F to +140°F) |
| Body | Brass Barstock |
| Bonnet | Brass Barstock |
| Piston | Brass |
| Seal | FKM / EPDM |
| Valve Seat | Polyamide (Nylon®) |
| Filter | 10 Micron 316L Stainless Steel |
* Subject to cylinder connection – ** Cylinder connection not included
Please note: If you require a test certificate with your regulator, it must be ordered at the same time. Our certification product can be found here: Gas Arc Regulator Test Certificate
Data Sheet can be found in Documents Section
| Brand | Gas Arc |
| Entry Point | Base Entry, Side Entry |
| Inlet Connection | BS341 No.3 |
| Outlet Connection | 1/4" NPT |
| Inlet Pressure | 300 bar |
| Outlet Pressure | 250 bar |
| Purity Grade | Grade 4.5 |
| Stages | Single Stage |
| Gas Type | Inert |
Tech Master GPS420 Series - Technical Datasheet
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