The AirTAC GR30008LJNT 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, ordered without a 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 GR30008LJNT is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream pressure from your compressed-air supply. This is the low-pressure (L) type, so its setpoint range goes up to 0.4 MPa, and the 300 size with 1/4 in NPT ports suits compact branch lines and point-of-use drops. It carries no filter, no bowl and no drain, and this code has no gauge fitted (N) and no mounting bracket (J), though the GR body is also panel-mountable.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, standard or low-pressure regulation, gauge or no-gauge, and PT, G or NPT threads. Because AirTAC publishes flow only as curves rather than a single rated figure, we confirm the datasheet and flow figures for your application on request.
| Model | GR30008LJNT 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 | Not fitted |
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 |
Set a gentle holding pressure on a jig or fixture clamp circuit where the tooling spec caps working pressure at or below 0.4 MPa and a standard regulator's range would be overkill.
Feed a blow-off or air-assist manifold on a packaging line where operators need a repeatable, low setpoint that stays stable through shift-long cycling.
Regulate instrument-air feeds to benchtop rigs, sample dryers or pilot reactors that specify low supply pressures and a clean 1/4 in NPT connection point.
For sizing, step up through the GR sizes (200/300/400/600) against the flow your line needs - the port steps from 1/8 to 1 inch as the size grows. Choose the standard type for setpoints up to 0.9 MPa, or this low-pressure (L) type when your process runs at or below 0.4 MPa. Decide whether you want a gauge (square embedded or round external, in MPa, psi or bar scales) - this code ships without one - and whether a bracket is needed for wall or panel mounting. On threads, PT is the standard; G (BSPP) and NPT are catalogue options ordered by suffix, as with this NPT version. Flow is published as curves, not a single rating, so 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 regulator flow as curves rather than a single rated number, so we do not quote a fixed l/min or SCFM figure. Tell us your inlet pressure, setpoint and expected consumption and we will confirm the flow and datasheet figures for this model on request.
L marks the low-pressure type: its setpoint range goes up to 0.4 MPa instead of the standard 0.9 MPa. N means no gauge is fitted (you can order a gauge version), and J means no mounting bracket is included, though the GR body can also be panel-mounted.
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.