The AirTAC GFR400-15ALJF1WT AirTAC Filter Regulator NPT1/2 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 PT1/2" 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 GFR400-15ALJF1WT is a 400-size filter regulator: it removes water and particulate from compressed air through a 5 um element (code W) and regulates downstream pressure in a single body. This unit is the low-pressure type (code L), intended for circuits that run below standard regulator settings; the exact adjustment range is not published, so confirm it against your set pressure before ordering. It is built with an automatic drain that expels collected condensate without manual attention, a square pressure gauge on the MPa scale, and a 1/2 in NPT port (PT is the standard thread; G and NPT are catalogue order options). Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, drain choices of differential-pressure, automatic or manual, 40 um standard or 5 um (W) filtration, and gauge or no-gauge builds; the polycarbonate bowl on this 400 size is transparent for a visual condensate check (size 600 uses aluminium alloy). Flow is published as curves rather than a single rated figure, so send us your application details and we will confirm sizing and datasheet figures on request.
| Model | GFR400-15ALJF1WT AirTAC Filter Regulator NPT1/2 |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (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 | Not fitted |
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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| J | Supplied without bracket. |
| (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. |
| (blank) | No reverse-flow valve (the default). |
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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
On a CNC fixture that clamps workpieces with air at reduced pressure, this unit filters the supply to 5 um and holds a low regulated setting, protecting the clamp cylinders from water and swarf-laden air while the automatic drain keeps condensate off the circuit.
At a paint or powder-coating booth, the 5 um element strips water and fine particulate before the atomising air line, and the low-pressure regulator suits coating guns and applicators that operate below standard shop-air settings.
On a cartoning or wrapping line, this unit feeds the machine's air cylinders with filtered, regulated air at a reduced pressure for gentle product handling, while the automatic drain and MPa gauge let operators verify supply condition at a glance.
Size and port step up with flow demand: the 400 size with a 1/2 in NPT port sits in the upper-middle of the GFR range (200/300/400/600, ports 1/8 to 1 in). Choose the drain to match your maintenance routine: automatic (this unit) suits unattended installations, manual suits periodic checks, and differential-pressure is the catalogue default. Filtration grade here is 5 um (code W) versus the 40 um standard - choose 5 um where downstream valves and cylinders need finer protection. The square gauge is fitted with the MPa scale; psi or bar scales and an external round gauge are options. Because flow is published as curves, 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. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this family as characteristic curves, not as a single rated figure, so we do not quote a l/min or SCFM number. Tell us your application's flow and pressure requirements and we will confirm sizing against the datasheet curves on request.
L marks the low-pressure type of regulator. This unit is intended for circuits regulated below standard settings; its exact adjustment range is not published, so send us your set pressure and we will confirm suitability on request. The rest of the code decodes as: 400 size, 1/2 in NPT port, automatic drain, no bracket, square MPa gauge, 5 um filtration.
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.