The AirTAC GR40010LJF2GK AirTAC Air Regulator G3/8 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 PT3/8" 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 GR40010LJF2GK is an AirTAC GR400 series air pressure regulator built for compressed-air lines that must run at reduced, stable pressure. This is the low-pressure type, so it regulates up to 0.4 MPa rather than the standard full range, and it carries the K option: a built-in reverse (check) valve that holds downstream pressure if the upstream supply dips. The F2 gauge option means a square pressure gauge scaled in psi is fitted, and the J option means no mounting bracket is supplied. The port is G3/8 (BSPP) thread.
This is a genuine AirTAC part. The GR400 size is one of four in the GR family (200/300/400/600), with port sizes from 1/8 to 1 inch, G (BSPP) or NPT thread options, gauge scale choices, and a low-pressure variant available. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GR40010LJF2GK AirTAC Air Regulator G3/8 Low-Pressure |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (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 | 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.
| GR400 | G-series pressure regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 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. |
| 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 | GR400 · PT3/8" · 0.05 - 0.4 MPa (7 - 58 psi) |
|---|---|
| One size down | GR300 |
| One size up | GR600 |
| Line order | Filter first, then regulator, then lubricator |
On a CNC fixture line, workpiece clamps are held at a reduced, fixed air pressure so delicate parts are gripped without damage. The low-pressure regulation range and the built-in check valve keep the clamp pressure steady even if the shop supply sags.
In a paint line, atomising air to spray guns is regulated down to a gentle, repeatable setting. The G3/8 regulator sits at the booth drop, with the fitted psi gauge letting operators set and verify the same pressure on every shift.
On a packaging conveyor, air knives and blow-off nozzles clear dust and crumbs from containers before filling. The low-pressure type caps the supply so labels and lightweight packs are not knocked over, while the check valve stops backflow when the upstream line dips.
Pick the GR400 size and its 3/8-inch port by stepping up from the smaller GR200/GR300 when your line flow demands it; the exact flow capability is published as curves, not a single rating, so let us confirm sizing against your application. This unit is the low-pressure (L) type, correct only where your downstream equipment must never see more than 0.4 MPa - if you need the full 0.05-0.9 MPa range, choose a standard GR instead. The fitted square gauge reads in psi; MPa or bar scales and an external round gauge are order options. Thread here is G (BSPP); PT is the standard thread and NPT is also a catalogue option. The J code means no bracket is included, and the K code adds a reverse/check valve - useful where a dropped supply must not release downstream pressure.
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-series flow as curves rather than a single rated number, so we do not quote a rated flow, Cv or SCFM figure. Send us your line pressure and the flow your equipment needs, and we will confirm the sizing from the datasheet on request before you order.
The L in GR40010LJF2GK marks the low-pressure type, whose regulation range tops out at 0.4 MPa - choose a standard GR400 if you need up to 0.9 MPa. The K is a fitted reverse (check) valve, which holds the downstream pressure if the upstream supply drops. This unit also has a square gauge scaled in psi, a G3/8 (BSPP) port, and no mounting bracket (J).
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.