The AirTAC GFR400-15ALJC3WTK AirTAC Filter Regulator 1/2 NPT 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 GFR400-15ALJC3WTK is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single body. This 400-size unit is configured with a 1/2 in NPT port, the 5 um filter element (the tighter of the two published grades), an automatic drain that ejects collected condensate without manual attention, and the low-pressure regulator type. A round external gauge scaled in bar is fitted, and a reverse/check valve is built in. This code is the no-bracket (J) variant.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C, non-freezing. The polycarbonate bowl is standard at this size. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-15ALJC3WTK AirTAC Filter Regulator 1/2 NPT |
|---|---|
| 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 — round, bar 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
On a production line where clamp cylinders and pneumatic presses run at reduced pressure, this unit filters water and particles from the shop-air supply and holds the set pressure steady, with the automatic drain clearing condensate between shifts.
Bench test rigs and lab pneumatic circuits need clean, stable air at modest pressures. The 5 um element protects sensitive instruments and valves, while the low-pressure regulator type and bar-scaled round gauge make fine setting and reading straightforward.
Packaging machines and conveyor diverters driven by small air cylinders benefit from filtered, regulated air. This unit conditions the supply line, the reverse/check valve holds the circuit if upstream pressure dips, and the automatic drain keeps moisture out of the valves.
Size and port: the 400 frame with a 1/2 in NPT port sits in the middle of the GFR range (sizes 200/300/400/600, ports 1/8 in to 1 in) - step up or down a size as your air demand changes. Drain: automatic drains condensate by itself; manual and differential-pressure drains are the other catalogue choices. Filter grade: this unit carries the 5 um (W) element instead of the 40 um standard - choose 5 um where downstream equipment needs finer air. Gauge: a round external gauge scaled in bar is fitted here; embedded square gauges with MPa, psi or bar scales are the alternative. Thread: NPT on this code, with PT (the standard) and G available to order. Bracket: this is the no-bracket variant; a bracket version can be ordered. 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. 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 rather than a single rated figure, so there is no one l/min or SCFM number we can quote. Tell us your application and we will confirm the relevant datasheet figures on request before you order.
The L code marks the low-pressure regulator variant of the GFR400. The exact regulation range for this type is not published in the catalogue, so we confirm it on request. The unit otherwise follows the standard GFR decode: 1.0 MPa (145 psi) maximum inlet pressure, -5 to 70 C operation, and the automatic drain and 5 um element shown in the code.
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.