
Tech Master GPT420 Two Stage 2 Gauge Cylinder Regulator (Oxygen NEVOC) - 50 bar, Grade 4.5
- Two stage piston cylinder regulator for Oxygen NEVOC gas
- Maintains constant delivery pressure as cylinder pressure decreases
- Suitable for technical gases up to 4.5 purity (99.995%)
- Brass barstock body with FKM seal; inlet BS 341 No.32 side entry, outlet 3/8 BSP RH male
- Maximum inlet pressure 300 bar; delivery pressure 20–50 bar

4.5 Purity Two Stage Brass Barstock Piston Cylinder Regulator
GPT421 Series | Two Stage Piston Cylinder Regulator, FKM Seal
Comprising of: Cylinder Connection, Cylinder Contents Gauge, Outlet Pressure Gauge, Outlet Connection
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
The Tech Master GPT420 Series two stage piston cylinder regulators are designed for primary pressure gas control of non-corrosive or toxic, technical gases up to grade 4.5 purity (99.995%), on applications where constant delivery pressure is required as the cylinder pressure decreases.
Features
- Five port configuration
- Front panel mounting capabilities
- Encapsulated seat design
- Low wetted surface area
- Full range of inlet and outlet fittings
- Side entry
Gas Compatibility
This regulator is configured for Oxygen NEVOC
It is also available for the following gas types:
| Body | Brass Barstock |
| Bonnet | Brass Barstock |
| Piston | Brass |
| Seal | FKM |
| Valve Seat | Polyamide (Nylon®) |
| Filter | 10 Micron 316L Stainless Steel |
| Maximum Inlet Pressure | 300 bar (4350 PSI)* |
| Delivery Pressure Range | 20 bar (300 PSI) / 50 bar (725 PSI) |
| Gauges | 50mm (2″) Diameter |
| Connections | Inlet BS 341 No.32 (Side Entry) Nevoc, Outlet 3/8 BSP RH Male |
| Temperature Range | -20° C to +60° C (-4° F to +140° F) |
| Weight | 2.1 kg (4.7 lbs)** |
* Subject to cylinder connection – ** Cylinder connection not included
Flow Performance

Drawings

Model No. Selector Guide
For custom configuration please use the following table to create a model number and contact us for our best price (Example Model Number: GPT421-02-07-00-00-000-00-A)
| Product Type | Inlet Pressure (Bar / PSI) | Outlet Pressure (Bar / PSI) | Inlet Pressure Gauge | Outlet Pressure Gauge | Inlet Connection | Outlet Connection | Options |
|---|---|---|---|---|---|---|---|
| GPT421 | 02 – 60 bar (870 PSI) | 07 – 0 to 20 (300 PSI) | 00 – No Gauge Fitted | 00 – No Gauge Fitted | 000 – 1/4″ NPT Female | 00 – 1/4″ NPT Female | A – No Options Selected |
| GPT422 | 04 – 300 bar (4350 PSI) | 10 – 0 to 50 (725 PSI) | 01 – bar/PSI | 01 – bar/PSI | 001 – 1/8 Stainless Steel Compression | 01 – 1/8 Stainless Steel Compression | F – Bonnet Vent Kit |
| 10 – Plugged Port | 10 – Plugged Port | 002 – 1/4 Stainless Steel Compression | 02 – 1/4 Stainless Steel Compression | K – Certificate of Conformity (CoC) | |||
| 003 – 6mm Stainless Steel Compression | 03 – 6mm Stainless Steel Compression | L – Panel Mount Locking Nut Kit | |||||
| 004 – 1/4 NPT Male | 04 – 1/4 NPT Male | P – Calibration / Pressure Test Certificate | |||||
| 007 – G3/8 BSP R/H Brass Male | 05 – 1/4 SAE Flare Brass Male | X – Special Instruction | |||||
| 008 – G3/8 BSP L/H Brass Male | 06 – G1/2 BSP R/H Brass Male | ||||||
| 009 – BS341 No.3 (Base Entry) | 07 – G3/8 BSP R/H Brass Male | ||||||
| 010 – BS341 No.3 | 08 – G3/8 BSP L/H Brass Male | ||||||
| 011 – BS341 No.4 (Base Entry) | 09 – Isolation Valve, 1/4 NPT Female, FKM Seal | ||||||
| 012 – BS341 No.4 | 10 – Isolation Valve, 1/4 NPT Female, EPDM Seal | ||||||
| 015 – BS341 No.8 | 11 – Isolation Valve, 1/8 Stainless Steel Compression, FKM Seal | ||||||
| 030 – DIN477 No.6 | 12 – Isolation Valve, 1/8 Stainless Steel Compression, EPDM Seal | ||||||
| 033 – DIN477 No.9 | 13 – Isolation Valve, 1/4 Stainless Steel Compression, FKM Seal | ||||||
| 034 – DIN477 No.10 | 14 – Isolation Valve, 1/4 Stainless Steel Compression, EPDM Seal | ||||||
| 045 – CGA320 | 15 – Isolation Valve, 6mm Stainless Steel Compression, FKM Seal | ||||||
| 052 – CGA540 | 16 – Isolation Valve, 6mm Stainless Steel Compression, EPDM Seal | ||||||
| 053 – CGA580 | 17 – Isolation Valve, 1/4 NPT Male, FKM Seal | ||||||
| 18 – Isolation Valve, 1/4 NPT Male, EPDM Seal | |||||||
| 19 – Isolation Valve, G3/8 BSP R/H Brass Male, FKM Seal | |||||||
| 20 – Isolation Valve, G3/8 BSP R/H Brass Male, EPDM Seal |
| Brand | Gas Arc |
| shopping_price_ranges | 500 - 1000 |
| Inlet Connection | BS341 No.32 |
| Inlet Pressure | 300 bar |
| Entry Point | Side Entry |
| Outlet Connection | 3/8 BSP Male Right Hand Outlet |
| Outlet Pressure | 20 bar, 50 bar |
| Gas Type | Oxygen |
| Stages | Multi Stage |
| Purity Grade | Grade 4.5 |
| SKU | Outlet Pressure | Purity Grade | Stock Status | |
|---|---|---|---|---|
| GPT421-04-10-01-01-023-07-A/3960026295 | 50 bar | grade 4 5 | In Stock | £595.40 ex VAT £714.48 inc VAT |
| GPT421-04-07-01-01-023-07-A/3960026288 | 20 bar | grade 4 5 | In Stock | £595.40 ex VAT £714.48 inc VAT |
Tech-Master-GPT420-Regulator-Datasheet.pdf
Download PDFA carriage charge is applied to orders, for standard 1-2 day shipments to mainland destinations within the United Kingdom. Other destinations and premium services are available but subject to additional freight charges.
Get in touch
Have a question about this product? Our team of welding experts are here to help.
Visit Us
12 Mary Seacole Road
The Millfields
Plymouth, Devon
PL1 3JY













