The AirTAC GFR400-15ALJF2WT AirTAC Filter Regulator NPT1/2 Low-Pressure 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.
This GFR400-15ALJF2WT is an AirTAC GFR400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 400 size with a 1/2 in NPT port, an automatic drain that ejects collected condensate without manual attention, a 5 um filter element (the finer of the two published grades), the low-pressure regulator type, a fitted embedded square gauge scaled in psi, and no mounting bracket. Maximum working (inlet) pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with a choice of port sizes, PT (standard), G or NPT threads, differential-pressure, automatic or manual drains, 40 um standard or 5 um (W) filtration, standard or low-pressure regulation, gauge and bracket options, and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-15ALJF2WT AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| 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, psi 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. |
| 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. |
| 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) |
Feeds filtered, regulated air to the film-sealing and clamp cylinders on a packaging machine, with the automatic drain clearing condensate through long production shifts and the psi gauge giving operators a direct pressure readout at the machine.
Supplies clean, low-pressure regulated air to bench-top test rigs and lab apparatus where the 5 um element protects sensitive instruments from particulate and water carryover and fine pressure control matters.
Conditions the atomising air feed to spray guns in a finishing booth: the 5 um grade keeps moisture and dirt out of the finish, while the low-pressure regulator type and psi gauge let the booth operator hold the delicate atomising pressure the coating calls for.
Choose the size and port step against the air demand of the circuit: this is the 400 size with a 1/2 in NPT port, one step up from the 300 series, and larger sizes carry higher flow capacity - we can confirm exact flow from the datasheet curves on request. This unit carries the 5 um (W) element rather than the 40 um standard grade, so pick it where finer particulate removal matters, and the automatic (A) drain, which suits unattended or hard-to-reach installations; manual and differential-pressure drains are available in the same family if you prefer operator-controlled or pressure-differential draining. The low-pressure (L) regulator type is selected where the controlled pressure sits in a lower band than a standard unit is intended for; the exact published range for this low-pressure type is not stated in our data, so confirm it with us. The fitted square gauge reads in psi (scale 2); MPa and bar scales and an external round gauge are alternatives. NPT is the thread on this code; PT is the catalogue standard and G (BSPP) is also an order option. A mounting bracket is not included with the J suffix but is available on other variants. Before ordering, ask us to check the flow curves against your application.
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 series as performance curves rather than a single rated figure, so no one flow number exists to quote. Send us your application details and we will confirm the relevant flow figures from the datasheet before you order.
The A in the code selects the automatic drain, which ejects collected condensate on its own - a good choice where the unit is mounted in a hard-to-reach spot; manual and differential-pressure drains are alternatives in the same family. The W selects the 5 um element instead of the 40 um standard grade. This is the L (low-pressure) regulator type; the exact regulation range for the low-pressure type is not published in our data sheet extract, so please confirm it with us. Maximum inlet pressure is 1.0 MPa (145 psi) and the temperature range is -5 to 70 C.
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.