The AirTAC GFR300-08LJF2WK AirTAC Filter Regulator 1/4 in, 5 um 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 PT1/4" ports, a differential-pressure 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 GFR300-08LJF2WK is an AirTAC GFR300 filter regulator: filtration and pressure regulation combined in one body, removing water and particulate from compressed air and setting the downstream pressure. This configuration is built for a PT1/4 (1/4 in) port and carries the 5 um filter element (code W) in place of the 40 um standard, so the air is polished more finely before regulation. It is the low-pressure type (code L), fitted with an embedded square gauge reading in psi (code F2) and a reverse/check valve (code K). Condensate leaves through the differential-pressure drain, the default for this family, and the polycarbonate bowl is standard at the 300 size. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and options for manual or automatic drains, 40 um or 5 um filtration, gauge scales in MPa, psi or bar, G (BSPP) or NPT threads, and bracket choices. As the low-pressure type, its exact regulation range is not published in the catalogue. We confirm the regulation range and the flow curves from the datasheet on request.
| Model | GFR300-08LJF2WK AirTAC Filter Regulator 1/4 in, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT 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 | Differential-pressure 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". |
| (blank) | Drain: Differential-pressure 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. |
| (blank) | PT 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a spray booth drop, the 5 um element polishes the air before regulation and the low-pressure type lets the line set a reduced working pressure at the gun supply, with the psi gauge read directly at the point of use.
A test bench fed from the shop air main uses this unit to filter the supply to 5 um and hold a low, stable setting for instruments, with the square psi gauge giving a clear local reading and the check valve fitted in the line.
On a cartoning conveyor, the 1/4 in port suits compact cylinder and air-blow circuits; the unit filters the main supply and regulates it down for the actuators, with the differential-pressure drain clearing condensate automatically in service.
The choices on this family are all decodable from the code. Size 300 with a 1/4 in port sits mid-range in the 200/300/400/600 ladder; step up or down a size when the application demands more or less flow. Flow is published as curves rather than a single rating, so ask us to confirm sizing against your application before ordering. Drain type is a real choice: differential-pressure (the default on this unit), automatic (code A) or manual (code M). Filter grade is 40 um standard or 5 um with code W, as fitted here. The gauge can be the embedded square type in MPa, psi or bar scales, or an external round gauge; this unit reads psi. Thread is PT as standard, with G (BSPP) and NPT as order options, and the bracket can be omitted with code J, as on this unit. The L code marks the low-pressure type, selected when the circuit runs at reduced pressure; its exact regulation range is not published, so confirm it with us.
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, not as a single rated figure, so we do not quote a number here. Send us your required flow and working pressure and we will confirm sizing for this 1/4 in, 300-size unit from the datasheet on request.
The W in the code selects the 5 um filter grade, which removes finer particulate than the 40 um standard element. Choose 5 um where downstream equipment needs cleaner air; choose the standard 40 um grade where general protection is enough. Both grades are catalogue options across the GF, GFR, GFC and GC families.
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.