The AirTAC GR400-10LJC2K AirTAC Air Pressure Regulator PT3/8 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 GR400-10LJC2K is an AirTAC GR-series air pressure regulator: it does one job, holding your downstream pressure steady as upstream supply and air demand fluctuate. This is the low-pressure type (code L), set up for circuits that must run below the standard range, with a maximum working inlet pressure of 1.0 MPa (145 psi) and an adjustment range up to 0.4 MPa. It is the size 400 body with a 3/8 inch PT port, and it carries no filter, no bowl and no drain - regulation only. The C2 code specifies an external round gauge with a psi scale, and the K code means a reverse (check) valve is fitted, so downstream pressure is held if the upstream supply drops.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, standard or low-pressure regulation, gauge and scale choices, an optional reverse valve, and G (BSPP) or NPT threads as order options alongside the PT standard. Flow figures for GR regulators are published as curves rather than a single rating, so ask us to confirm sizing against your application before you order.
| Model | GR400-10LJC2K AirTAC Air Pressure Regulator PT3/8 |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (PT 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, 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | PT 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 |
Fixture clamps that must close gently and hold at a low setpoint need a regulator that stays stable well below standard line pressure. This low-pressure GR with a check valve holds the clamp force even if the main supply dips.
Test rigs and small process lines often run instruments and actuators at reduced pressure and need it held constant while flow varies. A low-pressure GR at the bench take-off keeps the setpoint steady, with a psi dial for direct reading.
Blow-off and air-knozzle stations on packaging lines run best at a fixed low pressure rather than full line pressure. Regulating the branch down with this GR reduces waste at the nozzle and keeps the jet consistent across the shift.
Start with the port step: this unit is size 400 with a 3/8 inch PT port, so match it to your line size and let the required flow - confirmed from the curve data on request - tell you whether 400 is the right step or whether you should move up or down in the 200/300/400/600 range. The L code makes this the low-pressure type, limited to 0.4 MPa: choose it only if your setpoint genuinely sits in that band, otherwise the standard GR covers 0.05-0.9 MPa. The C2 gauge gives you a round dial reading in psi; square embedded gauges and MPa or bar scales are the other decodable choices. The K code adds a reverse (check) valve - useful where a sudden supply loss must not dump your set pressure. Threads are PT as standard with G (BSPP) and NPT available to order, and the J code means no mounting bracket is supplied. Because flow is published as curves and not a single rating, send us your application details and we will confirm the sizing before you order.
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 regulator flow as performance curves rather than a single rated figure, so we do not quote a number like l/min or SCFM. Tell us your inlet pressure, setpoint and expected air demand, and we will confirm the sizing from the datasheet curves before you order.
L marks the low-pressure type: adjustment is limited to 0.4 MPa instead of the standard GR range, for circuits that run at reduced setpoints. The K code means a reverse (check) valve is fitted, so if upstream supply fails, the check valve keeps the regulated downstream pressure from bleeding back - useful for clamps and holding circuits. This unit also has a round psi-scale gauge (C2), no mounting bracket (J), and a PT 3/8 inch port, with G or NPT threads available to order.
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.