The AirTAC GR30008LJF2G AirTAC Regulator G1/4 Low-Pressure is a genuine G-series air pressure regulator. It holds a stable downstream pressure over the range 0.05 - 0.4 MPa (7 - 58 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 AirTAC GR300 is a pure air pressure regulator: it controls downstream pressure only, with no filter element, no bowl and no lubrication in the body. This configuration, GR30008LJF2G, is the 300 size with a G1/4 (BSPP) threaded port, built as the low-pressure type with a setting range up to 0.4 MPa, so it suits circuits that must run well below full line pressure. The embedded square gauge is fitted with a psi scale for direct reading, and the maximum inlet pressure is 1.0 MPa (145 psi). Because it is a GR, the unit also tolerates a wider ambient range than the rest of the G family: -20 to 70 C, non-freezing medium. No mounting bracket is included in this version (J suffix), and GR bodies are also panel-mountable.
This is a genuine AirTAC part. The GR line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in standard or low-pressure types, with or without a gauge, and with PT as the standard thread and G or NPT as order options. Published flow data appears as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application before you order.
| Model | GR30008LJF2G AirTAC Regulator G1/4 Low-Pressure |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Regulating range | 0.05 - 0.4 MPa (7 - 58 psi) |
| Pressure type | Low-pressure type |
| Bracket | Supplied without bracket |
| 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 | Not fitted |
| 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". |
| L | Low-pressure type — 0.05 - 0.4 MPa (7 - 58 psi). Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (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. |
| (blank) | No reverse-flow valve (the default). |
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 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR200 |
| One size up | GR400 |
| Line order | Filter first, then regulator, then lubricator |
On a screen-printing machine, the squeegee and flood-bar cylinders often need a deliberately gentle, stable air pressure well below main line pressure. This low-pressure GR300 regulator, set up to 0.4 MPa with its psi gauge, lets the operator dial in and read the exact setting for consistent print stroke force.
Capping and press-on heads on a bottling line can crush caps or damage containers if fed at full line pressure. A 300-size regulator with a 1/4 in G-thread port drops the supply to the low pressure the capping stroke needs, and the psi gauge gives the line technician a visible, repeatable setpoint.
A lab or QC bench used for low-pressure leak and function tests on pneumatic components needs fine control at the low end of the range. The GR300 low-pressure type regulates the test circuit up to 0.4 MPa, the square psi gauge reads the test pressure directly, and the -20 to 70 C operating range covers an unheated workshop or lab.
Start with the port step: the 300 size here carries a 1/4 in port, and moving up to 400 or 600 gives a larger port and more flow capacity - match the size to the air demand of the circuit rather than oversizing on guesswork. Next, choose the regulator type: this unit is the low-pressure type, with a setting range up to 0.4 MPa; if your circuit needs settings above that, the standard GR type (0.05-0.9 MPa) is the correct choice. Decide on the gauge: this version has the embedded square gauge with a psi scale, and MPa or bar scales are available. On threads, PT is the standard; G (BSPP) and NPT are catalogue options ordered by suffix - this unit is the G version. Bracket: the J suffix means no bracket is supplied, though GR also mounts in a panel.
One honest note on sizing: AirTAC publishes flow for the GR line as curves, not as a single rated number, so we do not quote a flow figure here. Send us your application details and we will confirm the sizing against the datasheet curves before you order.
Quick checklist
Without a reflux valve, air cannot flow back through the regulator — order the K option if reverse flow is required. A regulator does not remove water or particulate; that is the filter's job.
AirTAC publishes flow for the GR line as performance curves, not as a single rated figure, so we do not quote a flow number here. Tell us your inlet pressure, setting pressure and the air demand of your circuit, and we will confirm the sizing against the datasheet curves on request before you order.
The F2 in the model code means the embedded square gauge is fitted with a psi scale, so the downstream setting can be read directly in psi. If your plant works in MPa or bar, the same GR300 regulator is available with those gauge scales - just specify the scale code when ordering.
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.