The AirTAC GR300-08 AirTAC Air Pressure Regulator PT1/4, 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 for compressed air, built purely for regulation: it steps a variable supply pressure down to a stable, adjustable working pressure downstream. This configuration is the 300 size with a PT1/4 (1/4 in) PT thread port, the standard regulator type with an adjustment range of 0.05-0.9 MPa (7-130 psi), and a maximum inlet pressure of 1.0 MPa (145 psi). It carries the embedded square pressure gauge with a psi scale (external round gauges in MPa, psi or bar scales are available as options), and the K code means a reverse/check valve is fitted so downstream pressure is held if the supply is interrupted. A mounting bracket is included, and GR bodies are also panel-mountable. Operating temperature is -20 to 70 C - wider than the rest of the G family, which suits colder installations.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in PT (standard), G (BSPP) and NPT threads, with gauge scale, reverse-valve and low-pressure (L, up to 0.4 MPa) options to order. Flow for this series is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet and sizing figures for your application on request.
| Model | GR300-08 AirTAC Air Pressure Regulator PT1/4, psi gauge |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (PT 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. |
| (blank) | PT 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 |
On a robotic pick-and-place cell, the GR300-08 holds a steady, adjustable supply pressure to the gripper valves so part clamping behaves the same on every cycle, with the check valve holding the setting if the plant air drops.
On a carton-forming and sealing line, this regulator feeds the cylinder and valve manifold branch at a set pressure below the main header, protecting the actuators and keeping seal-arm timing consistent.
At a plant maintenance bench, the GR300-08 gives technicians an independently adjustable 1/4 in outlet for air tools, test rigs and blow-off stations, with the psi gauge making setpoints easy to read and repeat.
Choose the GR size by port step against the air demand of the downstream circuit: 200 (1/8-1/4 in), 300 (1/4-1/2 in), 400 (1/2-3/4 in) and 600 (1 in), with the port digits decoding 06 to 1/8 in, 08 to 1/4 in, 10 to 3/8 in, 15 to 1/2 in, 20 to 3/4 in and 25 to 1 in. Pick the gauge scale to suit your team - MPa, psi or bar - and the embedded square gauge or the optional external round gauge. Decide whether the reverse/check valve (K) is wanted to hold downstream pressure, and whether the standard type (0.05-0.9 MPa) or the low-pressure L type (up to 0.4 MPa) matches your setpoint. Thread is PT as standard; G (BSPP) and NPT are catalogue options to order. A mounting bracket is included unless the J (no bracket) code is specified.
One honest note on sizing: flow for GR regulators is published as pressure-loss curves, not a single rated number, so we do not quote a flow figure here. Tell us your line pressure, setpoint and air demand and we will confirm the correct size against the datasheet curves 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 GR regulator performance as pressure-loss flow curves rather than a single rated flow figure, so we do not state a Cv, l/min or SCFM number for this model. Send us your inlet pressure, setpoint and air demand and we will confirm the datasheet curves and correct sizing on request before you order.
F2 means the embedded square pressure gauge is fitted with a psi scale (MPa and bar scales are available, and an external round gauge is an option); K means a reverse/check valve is fitted to hold downstream pressure if the supply is lost. Both are catalogue options, so you can order the same GR300-08 regulator with a different gauge scale or without the check valve. The port here is PT1/4; G (BSPP) and NPT threads are also orderable options.
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.