The AirTAC GFR30008ALJF2GK AirTAC Filter Regulator G1/4, 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 GFR30008ALJF2GK is an AirTAC GFR-series filter regulator: water and particulate filtration plus pressure regulation combined in a single body with one drain bowl. This 300-size unit is threaded G1/4 (1/4 in BSPP), drains condensate automatically, carries the standard 40 um filter element, and is built as the low-pressure regulator type. A square pressure gauge scaled in psi is embedded, a reverse (check) valve is fitted, and no mounting bracket is supplied with this code.
It is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with port sizes from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drain, a 5 um element option (code W), gauge scales in MPa, psi or bar, and PT, G or NPT threads as order options. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing; the polycarbonate bowl suits this 300 size (only size 600 uses an aluminium alloy bowl). Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR30008ALJF2GK AirTAC Filter Regulator G1/4, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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.
| 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. |
| 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. |
| G | G (BSPP) 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) |
Supplying filtered, reduced-pressure air to spray guns and atomising headers in a finishing booth, where the low-pressure regulator type holds a gentle setting and the 40 um element keeps water and dirt out of the finish.
Feeding light-duty clamp cylinders on a machining or assembly fixture: the regulator sets the holding pressure, the automatic drain clears condensate without attention, and the fitted check valve supports the downstream circuit.
Conditioning supply air on laboratory test benches and pilot rigs that run at reduced pressure, where a compact G1/4 filter regulator with a psi-squared gauge keeps instruments fed with filtered, regulated air.
Size and port step up together: 200, 300, 400 and 600 map to progressively larger ports and flow capacity, here size 300 with a G1/4 thread. Choose the drain to match your maintenance routine: automatic (this unit) dumps condensate on its own, manual needs operator action, and the differential-pressure default bleeds with flow. The 40 um element is standard; specify code W for 5 um where finer particulate matters. The embedded square gauge here reads psi; MPa and bar scales are available and an external round gauge is optional. Threads come as PT (the standard), G or NPT to order, and brackets are optional - this code omits one. Note this is the low-pressure regulator type; its exact adjustment range is not published in the material we hold, so confirm it with us. 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 the GFR series as curves rather than a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow and full datasheet figures for this exact model on request.
The L selects the low-pressure regulator type; its exact adjustment range is not published in the material we hold, so confirm it with us before ordering. The trailing K means a reverse (check) valve is fitted. This unit also has an automatic drain, a 40 um element, an embedded square gauge reading psi, a G1/4 thread and no bracket.
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.