The AirTAC GFR400-10 AirTAC Filter Regulator G3/8 Low-Pressure 5 um is a genuine G-series filter regulator: water separation, 5 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" ports, a differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR400-10 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body, so one component does both jobs at the 3/8 in port size. This configuration is the low-pressure regulator type with a 5 um filtration element (the finer of the two published grades), a differential-pressure drain that bleeds collected condensate automatically as flow passes through, a round external pressure gauge reading in psi, and a built-in reverse/check valve that holds downstream pressure when the upstream supply is lost. It is supplied without a mounting bracket, and the thread is G (BSPP).
This is a genuine AirTAC part in the GFR400 series. The GFR family spans sizes 200, 300, 400 and 600 with a choice of ports, drain types, 40 um or 5 um elements, gauge styles and scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures against your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator G3/8 Low-Pressure 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (G (BSPP) thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure type |
| Adjusting mechanism | Balanced type |
| Fluid | Compressed air |
|---|---|
| Max. working pressure | 1.0 MPa (145 psi) |
| Temperature range | -5 to +70 °C (unfreeze) |
| Drain type | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi scale |
| Reflux valve | Fitted (reverse flow permitted) |
Specifications follow the official AirTAC G-series air-preparation data. The regulating band is set by the drain type: automatic and differential-pressure drains regulate 0.15 - 0.9 MPa, a manual drain regulates 0.05 - 0.9 MPa. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. Air must not freeze in the unit. Flow curves, weight and outline dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
| GFR400 | G-series filter regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| L | Low-pressure type. 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. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| 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, drain, type, bracket, gauge, shape, scale, grade, thread, reflux — a blank position takes the default. Example: GFR300-08 is a 300 body, PT1/4", differential drain, standard type, bracket included, gauge fitted, 40 µm, PT thread, no 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. The GFR600 uses an aluminium-alloy bowl; the 200, 300 and 400 bodies use PC.
| This model | GFR400 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
On a fixture-clamping manifold that operates at reduced pressure, the GFR400-10 filters the supply to 5 um, regulates it with the low-pressure type regulator, and the built-in check valve holds the clamp circuit if the main air drops.
Feeding directional valves and actuators on a carton-forming packaging line, this 3/8 in filter regulator cleans the air and sets a stable reduced pressure, with the round psi gauge giving operators a clear local reading.
For bench-top pneumatic test rigs and analytical instruments sensitive to water and fine particles, the 5 um element and differential-pressure drain keep the supply clean without manual draining between runs.
Start with the port: this unit is the size 400 body with a G3/8 (3/8 in) G-thread connection - step up to size 600 if your line needs larger flow capacity, or down to 200/300 for compact circuits. On filtration, 40 um is the standard element and 5 um (this model, code W) suits finer-protection downstream equipment; pick the grade your valves and cylinders need. Drain choice is differential-pressure (this model, automatic with flow), automatic, or manual - use manual where you want controlled, scheduled draining. The low-pressure regulator type here is intended for reduced-pressure circuits; the exact adjustment range for the L type is not published, so confirm it with us. Gauge options are the embedded square gauge or an external round gauge in MPa, psi or bar scales (this unit: round, psi). Thread is PT as standard with G and NPT as order options, and a bracket is optional (not fitted here).
One honest note on sizing: flow for this series is published as curves, not a single rated figure, so send us your application details and we will confirm the right size before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this series as curves, not as a single rated number, so we do not quote a flow figure here. Send us your application details - port size, downstream demand and pressure - and we will confirm the sizing from the datasheet on request.
The L code marks the low-pressure regulator type, intended for circuits regulated well below standard working pressure; the exact adjustment range for the L type is not published, so confirm it with us before ordering. The K code means a reverse/check valve is fitted, which holds downstream pressure if the upstream supply is interrupted. This unit also carries the 5 um element (code W) instead of the 40 um standard, a differential-pressure drain, and a round psi gauge.
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.