The AirTAC GFR300-08ALJF3TK AirTAC Filter Regulator NPT1/4 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 PT1/4" 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 GFR300-08ALJF3TK is an AirTAC GFR300 filter regulator: filtration and pressure regulation combined in a single body. This configuration is ported 1/4 in NPT, carries a 40 um filter element, drains condensate automatically from the polycarbonate bowl, and uses the low-pressure regulator type. An embedded square gauge scaled in bar is fitted, a reverse/check valve is included, and no mounting bracket is supplied. In use, compressed air enters the unit, water and particulate are separated into the bowl and discharged automatically, and the downstream pressure is set at the regulator.
This is a genuine AirTAC part. The GFR300 series is the size-300 step of the G-series range, which spans sizes 200, 300, 400 and 600 with port options from 1/8 to 1 in and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow for this series is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-08ALJF3TK AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (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 | 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.
| GFR300 | G-series filter regulator, 300 body — sets the port range. |
|---|---|
| 08 | Port size PT1/4". This body offers 08 = PT1/4", 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. |
| 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 | GFR300 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeding filtered, regulated air to the valve manifold on a packaging machine's pneumatic panel, where the low-pressure regulator type and automatic drain keep the downstream circuit set and the bowl emptied without daily operator attention.
Supplying the air cylinders that divert, stop and clamp product on a conveyor line, with the 40 um element catching pipe scale and the reverse/check valve holding the set pressure against upstream fluctuation.
Conditioning the bench air feed to a laboratory rig or test station, where the square bar gauge gives a clear local pressure readout and the automatic drain handles condensate from an intermittently used compressed air drop.
Size and port are the first choice: the 300 size with a 1/4 in NPT port sits in the middle of the 200/300/400/600 range, so step up or down a size if your circuit needs more or less flow. Drain is automatic on this unit, which suits duty where nobody empties the bowl daily; manual and differential-pressure drains are available in the series if you prefer operator-controlled or load-proportional draining. The 40 um element is the standard grade; a 5 um element (code W) is offered where finer filtration is needed. The embedded square gauge is scaled in bar, and external round gauges with MPa, psi or bar scales are optional; G or NPT threads can be ordered in place of the PT standard, and a bracket can be added. Flow for the series is published as curves, not a single rating, so 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.
Flow for the GFR300 series is published as curves rather than a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the datasheet flow data for this 1/4 in NPT unit before you order.
The A in the code means the polycarbonate bowl discharges collected condensate automatically, so the unit does not rely on manual emptying. Manual (code M) and differential-pressure (blank) drains are also available in the GFR300 series if you prefer a different draining arrangement.
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.