The AirTAC AirTAC GFR400-15ALJF2K Filter Regulator PT1/2 Low-Pressure is a genuine G-series filter regulator: water separation, 40 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 GFR400-15ALJF2K is a size-400 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is a low-pressure regulation type with a 40 um standard filter element, an automatic drain that expels collected condensate without manual attention, a fitted reverse/check valve, and an embedded square gauge reading in psi. The port is PT1/2 (1/2 in PT thread), and no mounting bracket is included with this code.
This is a genuine AirTAC part. The GFR series is offered in sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, drain choices (differential-pressure, automatic or manual), a 5 um element option (code W), gauge and scale options, and PT, G or NPT threads to order. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures on request.
| Model | AirTAC GFR400-15ALJF2K Filter Regulator PT1/2 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (PT thread) |
| Filtering grade | 40 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, 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. |
|---|---|
| 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · PT1/2" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
On an assembly fixture where clamps must close gently and hold at a reduced setting, this filter regulator cleans the supply air and holds the low set pressure at the clamp cylinders, with the automatic drain keeping condensate out of the valves.
At a bench drop on a lab or test-cell compressed-air ring main, the unit filters incoming particulate and water and lets the operator dial a stable low working pressure for air-operated apparatus, checked on the psi gauge.
On a cartoning or wrapping line fed from a 1/2 in main, this unit conditions the air before the machine's directional valves and regulates the supply pressure the cylinders and vacuum generators actually see, with the check valve holding the setting against supply dips.
Start with the size and port: this is the size-400 unit with a 1/2 in PT port, the step to take when your line's flow demand sits above the 300 size - match the port step to the pipe and the air demand of the circuit. Because flow for this series is published as curves and not a single rated figure, ask us to confirm sizing against your application before ordering. Other real choices on this family: drain type (this code is automatic; differential-pressure and manual are also available), filter grade (40 um standard here, 5 um with code W), gauge scale (this one reads psi; MPa and bar scales exist), thread (PT is standard; G and NPT are order options), and bracket (this code omits it). The low-pressure regulation type is selected when the circuit works at reduced pressures; its exact adjustment range is not published, so confirm it with us.
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 performance curves, not as a single rated number, so we do not quote a figure here. Tell us your application and operating pressure and we will confirm the sizing from the datasheet on request before you order.
The A in the code means the bowl drains collected condensate automatically, so no one has to bleed it by hand. The rest decodes as: size 400 with PT1/2 port, low-pressure regulation type, 40 um standard element, no mounting bracket (J), square gauge reading psi (F2), and a fitted reverse/check valve (K).
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.