The AirTAC GR30008LJC3T AirTAC Low-Pressure Regulator NPT1/4 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 GR30008LJC3T is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream pressure from a compressed-air supply. This GR300 configuration is the low-pressure type, with an adjustment range of up to 0.4 MPa, on 1/4 in NPT ports. It carries an external round pressure gauge with a bar scale so the set point can be read directly at the unit, and the J suffix means it is supplied without a mounting bracket; the GR series is also panel-mountable. As a pure regulator it contains no filter, no bowl and no drain, and it performs no lubrication.
This is a genuine AirTAC part in the GR300 size, one step in a range that runs from GR200 through GR300, GR400 and GR600 with progressively larger ports and flow capacity. Across the series you can choose standard or low-pressure regulation, gauge style and scale, a reverse/check valve, bracket or no bracket, and PT, G or NPT thread. We confirm flow and datasheet figures for your application on request, since flow is published as curves rather than a single rating.
| Model | GR30008LJC3T AirTAC Low-Pressure Regulator NPT1/4 |
|---|---|
| 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 — round, 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). |
| C | Gauge shape: Round. 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 |
On a machine with solenoid or air-pilot directional valves, this regulator holds a steady, reduced pilot pressure to the valve actuators, keeping shift behaviour consistent even as the main supply pressure wanders.
Bench-mounted test rigs, air bearings and low-pressure lab apparatus that must not see full line pressure get a controlled setting at or below 0.4 MPa from this low-pressure GR300, read directly on its bar-scale gauge.
On packaging and conveyor lines, gentle hold-down rollers, clamps and pushers fed from this regulator receive a fixed, repeatable pressure, so parts are gripped firmly without crushing or marking.
Start with the port step: GR300 on 1/4 in NPT sits in the middle of the 200/300/400/600 size ladder, and the right size depends on the air demand of the circuit it feeds. Then pick the regulator type: this unit is the low-pressure (L) version, correct where the working pressure must stay at or below 0.4 MPa; the standard GR covers the full 0.05-0.9 MPa range. Decide the gauge: this code specifies an external round gauge with a bar scale, while an embedded square gauge with MPa, psi or bar scales is also available. Choose the thread - PT is the catalogue standard, with G (BSPP) and NPT as order options - and whether to include a mounting bracket (this unit has none) or a reverse/check valve (not fitted here).
Because published flow data takes the form of curves rather than a single rated figure, ask us to confirm sizing against your application before ordering.
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 GR-series flow as curves rather than a single rated figure, so there is no one rated flow number we can honestly quote. Send us your application details and we will confirm the flow and sizing from the datasheet on request before you order.
The L in GR30008LJC3T marks the low-pressure type, with an adjustment range of up to 0.4 MPa instead of the standard GR range; the J means no mounting bracket is supplied, and C3 specifies an external round gauge with a bar scale. The T at the end sets the ports to NPT thread.
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.