The AirTAC AirTAC GFR40010ALF1WTK Filter Regulator 3/8 in NPT, 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 automatic 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 GFR40010ALF1WTK is a size 400 filter regulator: water and particulate filtration plus pressure regulation combined in a single body. This configuration is ordered with a 3/8 in NPT port, a 5 um filter element (code W) for finer filtration than the standard 40 um grade, an automatic drain that expels collected condensate without manual intervention, and the low-pressure regulator type for circuits that run below standard regulating ranges. A square pressure gauge scaled in MPa is fitted, a reverse/check valve is included, and the unit comes with a mounting bracket. The polycarbonate bowl suits non-freezing compressed-air service from -5 to 70 C, with a maximum inlet pressure of 1.0 MPa (145 psi).
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in up to 1 in. Across the series you can choose manual, automatic or differential-pressure draining, a 40 um or 5 um element, gauge style and scale, thread option and bracket preference. Flow is published as curves rather than a single rating, so send us your application details and we will confirm the sizing and full datasheet figures on request.
| Model | AirTAC GFR40010ALF1WTK Filter Regulator 3/8 in NPT, 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, MPa 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". |
| A | Drain: Automatic 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT 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) |
Feeding spray guns and atomising lines where air must be filtered to 5 um and held at a steady low pressure, with the automatic drain clearing condensate between shifts so moisture never reaches the finish.
Supplying pneumatic clamps and tool-change actuators on a machining centre, where the filter-regulator keeps chips and water out of the valves and the low-pressure type matches the clamp circuit's setting.
Regulating and filtering air to diverters, pushers and sealing cylinders along a packaging conveyor, with the reverse/check valve holding the set pressure if the upstream supply dips.
Start with the port step: this model is the size 400 body with a 3/8 in NPT port; smaller sizes 200/300 step down to 1/8-1/4 in and larger sizes 400/600 step up toward 3/4-1 in, so match the size to the air consumption of the circuit rather than the pipe alone. Drain choice matters: the automatic drain fitted here suits unattended installations, while manual and differential-pressure drain versions are available in the same family. Filtration grade is a real decision: 40 um is the standard element and the 5 um (W) element fitted here protects downstream equipment that is sensitive to finer particles. Gauge scale (MPa, psi or bar), thread option (PT is the standard; G/BSPP and NPT are catalogue options) and bracket preference can all be specified at order time. Because flow is published as curves and not a single rating, ask us to confirm sizing against your application before ordering.
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 the GFR series as curves, not as a single rated figure, so we do not quote a SCFM, l/min or Cv number. Send us your application details and we will confirm the flow-curve data and full datasheet figures for this exact model on request.
The A in the code GFR40010ALF1WTK specifies the automatic drain, which discharges collected condensate from the polycarbonate bowl without anyone opening it - useful for units mounted out of easy reach or on lines running unattended. The same GFR400-10 configuration is available with a manual drain or the differential-pressure drain as the default, and we can quote the alternative drain type on request.
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.