The AirTAC GR30008LJF3T AirTAC Air Regulator NPT1/4 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 GR30008LJF3T is an AirTAC GR-series air pressure regulator: it does one job, holding downstream pressure steady from a compressed-air supply. This configuration is the 300 size with a 1/4 in NPT port, built as the low-pressure type regulating up to 0.4 MPa, with an embedded square gauge reading in bar. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -20 to 70 C, wider than the rest of the G family. It ships without a mounting bracket; the GR series is also panel-mountable.
This is a genuine AirTAC part. The GR regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 in, in standard and low-pressure types, with a choice of gauge scale and PT, G or NPT threads. Flow figures are published as curves rather than a single rating, so ask us and we will confirm the datasheet numbers for your application on request.
| Model | GR30008LJF3T AirTAC Air Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GR300 pressure regulator |
| Port size | PT1/4" (NPT 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, bar 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. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| T | NPT 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 |
A machining cell that clamps delicate aluminium workpieces with air cylinders needs a steady, limited downstream pressure well below full line pressure. This regulator, set in bar on its square gauge, holds that low setpoint so clamping force stays repeatable part after part.
Heat-seal and forming stations on a packaging line use light-duty actuators that are damaged by full header pressure. A low-pressure GR300 on the 1/4 in branch feed lets a technician dial in and hold the pressure those actuators were designed for, with the gauge giving a clear local reading.
A blow-off station clearing dust from parts before inspection runs best at a gentle, fixed pressure. Fed from the shop main through this low-pressure regulator, the nozzles get a stable supply that does not scatter lightweight parts, and operators can read the setting at a glance.
Pick the GR size and port by the flow your line needs: 200 through 600 with ports from 1/8 to 1 in, stepping up as demand grows. This unit is the low-pressure type, capped at 0.4 MPa - if your circuit needs the standard 0.05-0.9 MPa range, choose a GR without the L code. Choose the gauge scale (MPa, psi or bar) and the thread: PT is the standard, with G and NPT as orderable options. A bracket can be included or omitted (this one has none), and the GR can also be panel-mounted. Flow is published as curves, not a single rating, so send us your application and we will confirm sizing against the datasheet 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 regulator flow as curves, not as a single rated figure, so there is no one flow number we can quote. We will confirm the datasheet flow curve for the GR300 at your conditions on request - just tell us your inlet pressure and expected consumption and we will check the sizing with you before you order.
The L in the code marks the low-pressure type of the GR series, which regulates up to 0.4 MPa. Standard GR units cover 0.05-0.9 MPa. If your circuit needs a setpoint above 0.4 MPa, the low-pressure type is the wrong choice - pick a standard GR300 in the same size and port instead.
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.