The AirTAC GR400-10 AirTAC Low-Pressure Air 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 GR400-10 is an AirTAC GR-series air pressure regulator: it does one job, holding a stable downstream pressure from a compressed-air supply, and it contains no filter, bowl or lubricator. This unit is the 400 size with a PT3/8 (3/8 in) port and is the low-pressure type, so its setting range tops out at 0.4 MPa - suited to circuits that must never see full line pressure. A square pressure gauge scaled in psi is fitted as standard, and the wide -20 to 70 C operating range makes it usable in colder environments than most G-series units. Maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GR family spans the 200, 300, 400 and 600 sizes with ports from 1/8 in to 1 in, in standard and low-pressure types, with your choice of thread (PT standard; G and NPT as order options), gauge scale and bracket. Published flow data appears as curves rather than a single rated figure, so ask us to confirm sizing against your application before ordering.
| Model | GR400-10 AirTAC Low-Pressure Air 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 — square, psi 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. |
| 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. |
| (blank) | PT 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 |
Packaging machines often use pneumatic clamps and hold-downs that must grip gently and consistently. This low-pressure regulator lets a technician set and hold a reduced pressure below 0.4 MPa on a 3/8 in line, with the fitted psi gauge giving a clear local reading at the set point.
Lint-blowing nozzles and web-cleaning jets on textile or converting lines run best at a modest, repeatable pressure. The GR400-10 regulates the 3/8 in jet supply down to the low range the process needs, and its -20 to 70 C range suits unheated plant corners and cold-season floors.
Bench-scale reactors, agitator seals and pneumatic test rigs in a lab pilot line often need a low, stable air pressure rather than full shop supply. This regulator sets a sub-0.4 MPa supply on a 3/8 in branch, with panel mounting available where a tidy instrument-air drop is required.
Start with the port step: the 400 size carries a 3/8 in port, and larger sizes move more air - match the size to the flow your circuit needs, then confirm it with us against the published flow curves. Choose the low-pressure type (this unit, up to 0.4 MPa setting) only where your process genuinely runs below that ceiling; otherwise the standard GR type covers 0.05-0.9 MPa. Pick the gauge scale you want to read - this unit ships with a square gauge in psi, with MPa and bar scales and an external round gauge as alternatives. Thread is PT as standard; G (BSPP) and NPT are catalogue options to order. Brackets are optional on GR, which is also panel-mountable - this configuration is supplied without a bracket.
One honest note on sizing: AirTAC publishes GR flow as curves, not a single rated number, so we cannot quote a rated flow figure here. Tell us your application and we will confirm the right size from the datasheet before you order.
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, not as a single rated figure, so we do not quote a rated flow number. Send us your application details - supply pressure, set pressure and the equipment on the line - and we will confirm the correct size from the datasheet before you order.
This is the L (low-pressure) type of the GR400: its setting range tops out at 0.4 MPa, for circuits that must not see full line pressure. The port is PT3/8 (PT is the standard thread; G and NPT are order options), the fitted square gauge is scaled in psi, and the unit is supplied without a bracket - GR is also panel-mountable.
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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.