The AirTAC GR400-10 AirTAC Air Pressure Regulator, NPT3/8, 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 AirTAC GR400-10 is a genuine AirTAC air pressure regulator in the 400 size, fitted with 3/8 in NPT ports. This unit is regulation only: it steps the incoming compressed air down and holds it steady at the set point, with no filtration or lubrication function. It is the low-pressure (L) type, so its adjustment range tops out at 0.4 MPa, and it carries an embedded square gauge scaled in bar as standard, with an external round gauge available as an option.
This is a genuine AirTAC part. The GR family spans sizes 200, 300, 400 and 600, with port sizes from 1/8 in to 1 in, PT as the standard thread and G or NPT as orderable options, plus a choice of gauge scale and a reverse/check valve where needed. Because flow is published as curves rather than a single rating, we confirm the datasheet and flow figures for your application on request.
| Model | GR400-10 AirTAC Air Pressure Regulator, NPT3/8, Low-Pressure |
|---|---|
| Series | GR400 pressure regulator |
| Port size | PT3/8" (NPT thread) |
| Regulating range | 0.05 - 0.4 MPa (7 - 58 psi) |
| Pressure type | Low-pressure type |
| Bracket | Fixing bracket included |
| 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.
| 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. |
| (blank) | Fixing bracket included. |
| (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 | 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 carton-sealing or case-packing line, cylinders and air grippers that clamp gently at low set points need a steady supply below 0.4 MPa. This low-pressure GR400-10 regulates the branch feeding those actuators, with the bar-scaled gauge letting operators read and re-set the pressure at a glance.
Bench-top test rigs and lab apparatus often run pneumatic components at deliberately low pressures. Fed from a shop-air drop through its 3/8 in NPT ports, this regulator holds a stable low set point for the rig, and the included bracket lets it be mounted right at the bench.
Conveyor lines that use low-pressure air for hold-down rollers, blow-off of light debris or diverting gates need a regulated branch set well below main-line pressure. This GR400-10 takes the 3/8 in feed, drops it to the low working pressure the station needs, and keeps it there as the main supply fluctuates.
Start with the port and size: this 400-size unit takes 3/8 in ports, and the GR range steps up through 200/300/400/600 as your air demand grows - match the size to the flow your line needs, and we will confirm the flow curve against your application before you order. Because this is the low-pressure (L) type, choose it only where your working pressure stays at or below 0.4 MPa; for higher set points use the standard GR. Pick the gauge scale you want (MPa, psi or bar) and the thread family: PT is the catalogue standard, with G (BSPP) and NPT as orderable options - this unit is the NPT version. A mounting bracket is included, and GR units are also panel-mountable.
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 we do not quote a flow number for this unit. Tell us your application and air demand and we will confirm the sizing against the datasheet flow curve on request before you order.
The L in the code marks the low-pressure regulator type, whose adjustment range tops out at 0.4 MPa. If your process needs set points above that, order the standard GR version instead; the standard range covers up to 0.9 MPa. Both types share the same 1.0 MPa maximum inlet pressure.
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.