The AirTAC GR300-08 AirTAC Air Pressure Regulator, G1/4, psi gauge is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.9 MPa (7 - 130 psi) with PT1/4" ports, and ships with a pressure gauge. A regulator does not filter the air — put a GF filter upstream, or use a GFR filter regulator, when water and particulate must also be removed.
The GR300-08 is an AirTAC GR-series air pressure regulator in the 300 size with a G1/4 (BSPP) port. It does one job only: reducing and holding a stable downstream pressure from a compressed-air supply, adjustable across 0.05-0.9 MPa (7-130 psi). This configuration is the standard type with a maximum inlet pressure of 1.0 MPa (145 psi), an embedded square pressure gauge reading in psi (external round gauges with MPa, psi or bar scales are catalogue options), a reverse/check valve fitted (code K) to hold downstream pressure when the upstream supply is removed, and a mounting bracket included; the GR body is also panel-mountable. Operating temperature is -20 to 70 C, wider than the rest of the G family.
This is a genuine AirTAC part. The GR line spans four sizes (200, 300, 400, 600) with port sizes from 1/8 to 1 inch, thread options PT (standard), G and NPT, a low-pressure type (L) limited to 0.4 MPa, gauge scale choices, and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GR300-08 AirTAC Air Pressure Regulator, G1/4, psi gauge |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard type |
| Bracket | Fixing bracket included |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -20 to +70 °C |
| Pressure gauge | Fitted — square, psi scale |
| Reflux valve | Fitted (reverse flow permitted) |
| Mounting | Panel mounting; optional fixing bracket |
Specifications follow the official AirTAC G-series air-preparation data. Note the GR temperature range is -20 to +70 °C, wider than the other G-series units. A regulator has no bowl and no filter element, so there is no filtering grade. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GR300 | G-series pressure regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Standard type — 0.05 - 0.9 MPa (7 - 130 psi). Blank is standard, L is the low-pressure type. |
| (blank) | Fixing bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| G | G (BSPP) thread. PT is the default; G is BSPP and T is NPT. |
| K | Reverse-flow (reflux) valve fitted. |
Field order is size, port, type, bracket, gauge, gauge shape, scale, thread, reflux — a blank position takes the default. Example: GR300-08LNK is a 300 body, PT1/4", low-pressure type, no gauge, with reflux valve.
A larger body carries a larger port and holds set pressure better as flow rises. AirTAC publishes flow only as curves, so size the body from your peak demand with headroom rather than from a single rated figure.
| This model | GR300 · PT1/4" · 0.05 - 0.9 MPa (7 - 130 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
Set a stable, repeatable downstream pressure for a pneumatic press or clamping fixture on a production line, with the psi gauge giving operators a direct readout at the machine. The check valve holds the set pressure if the plant air drops.
Feed cylinders and actuators on a packaging or labelling machine from a regulated branch of the shop-air system, keeping seal-bar and gripper pressures consistent shift after shift despite swings in the main header pressure.
Drop a dedicated regulator at the take-off point on a factory air line so one machine or work cell runs at its own set pressure instead of the header pressure, with the included bracket mounting the unit at the wall or frame.
Start with the size and port: the 300 size takes a 1/4 inch port here, and larger sizes (400, 600) carry larger ports and more flow capacity - match the step to the air demand of the circuit. Set the gauge to suit your team: this unit ships with an embedded square gauge in psi, and MPa or bar scales are available as options. Choose the thread deliberately: PT is the AirTAC standard, while G (BSPP, as coded here) and NPT are orderable options, so confirm which your pipework needs before ordering. If you need downstream pressure held when supply is lost, the reverse/check valve (K) does that - it is fitted on this unit. For very low working pressures, the low-pressure L type (up to 0.4 MPa) exists in the range. A mounting bracket is included and the GR also panel-mounts. One honest note on sizing: flow is published as curves, not a single rating, so send us your application details and we will confirm the right size against the datasheet before you order.
Quick checklist
The reflux valve lets air flow back through the regulator, which is useful when downstream volume must vent quickly. A regulator does not remove water or particulate; that is the filter's job.
AirTAC publishes regulator flow as curves, not as a single rated figure, so there is no one number we can honestly quote. The 300 size with its 1/4 inch port suits a defined band of air demand, and we will confirm the exact flow curve from the datasheet against your application on request - just tell us your supply pressure, set pressure and expected air consumption.
K means a reverse/check valve is fitted: it holds the regulated downstream pressure when the upstream supply is shut off or lost, which is useful for clamps and holding circuits. The same regulator is available without the check valve (blank position) if you do not need that function. The F2 in the code is the gauge: an embedded square gauge reading in psi, with MPa or bar scales available as alternatives.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity, thread type (PT / G / NPT), gauge scale and destination. We confirm price, availability and lead time — usually within 7-8 hours.