The AirTAC GFR400-15ALJF3T AirTAC Filter Regulator NPT1/2 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 GFR400-15ALJF3T is a size 400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration has a 1/2 inch NPT port, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, and a low-pressure regulator type fitted with an embedded square gauge scaled in bar. The polycarbonate bowl suits this non-freezing duty range, and the unit is supplied without a mounting bracket.
This is a genuine AirTAC part from the GFR series, which spans sizes 200 to 600 with port options from 1/8 to 1 inch, a choice of automatic, manual or differential-pressure drains, 40 um or 5 um (W) filtration, gauge scale options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures for your application on request.
| Model | GFR400-15ALJF3T AirTAC Filter Regulator NPT1/2 |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (NPT 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, bar 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. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
Supplies filtered, regulated air to clamping cylinders on machining fixtures, holding the set low-pressure point steadily through the clamp-stroke cycle while the automatic drain keeps condensate out of the valve stack.
Feeds carton-sealing and case-packing actuators on a packaging line, where the 40 um element protects directional valves from water and debris and the bar-scaled gauge gives operators a visible setpoint.
Provides a filtered, regulated branch off the plant air ring main for low-pressure process duties such as air knives, blow-off nozzles and purge lines, with the automatic drain handling condensate between shifts.
Size 400 with a 1/2 inch port sits in the upper flow range of the GFR series; step up to size 600 or down to 300/200 depending on the pipe bore and the curve for your flow demand. The automatic drain here suits unattended duty; choose manual drain where you prefer controlled blowdown, or differential-pressure drain as the catalogue default. The 40 um element is the standard grade; specify W for 5 um where finer particulate removal is needed. The square gauge is scaled in bar; psi and MPa scales and an external round gauge are alternatives. NPT is the thread on this unit, with PT (standard) and G available to order, and the J code means no bracket is fitted - add one if you want panel or wall mounting. Because flow is published as curves rather than a single rated figure, 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 GFR400 flow as curves, not as a single rated figure, so there is no one l/min or SCFM number we can honestly quote. Send us your line pressure, set pressure and expected air demand, and we will confirm the sizing from the datasheet on request before you order.
The L code marks the low-pressure regulator type, intended for duties set below the standard regulator range; the exact adjustment span for this type is not published in the sheet we transcribe, so we confirm it on request. The A code is the automatic drain, which expels collected condensate from the polycarbonate bowl by itself instead of waiting for a manual or differential-pressure drain event.
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.