The AirTAC GFR300-08 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 AirTAC GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one compact body. This 300-size unit is built with G1/4 (BSPP) ports, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, and an embedded square gauge reading in psi. It is the low-pressure type, intended for circuits that run below standard regulator settings, and it ships without a mounting bracket.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port options from 1/8" to 1", thread choices of PT, G or NPT, manual or automatic drains, a 5 um optional element, and gauge scale choices. Flow figures are published as curves rather than a single rating, so ask us to confirm sizing and datasheet details for your application.
| Model | GFR300-08 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 | 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.
| 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. |
| (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 | GFR300 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a machining-cell fixture line where workpieces are held with light, controlled clamping force, this filter regulator cleans the supply air and holds the reduced pressure the clamps were designed around.
For test rigs and lab benches running instruments and small pneumatic actuators at reduced pressure, the unit filters water and particulate from the shop supply and regulates the bench pressure, with the automatic drain keeping the bowl clear between runs.
On a packaging line where cylinders and air jets run at a set reduced pressure, this 300-size unit conditions the incoming air at the machine inlet, protecting valves and actuators from water and debris carried in the main supply.
Start with size and port: the 300 frame with G1/4 ports suits lines where 1/4" piping is the standard, and larger sizes step up in port and flow capacity. Choose the drain to match access: automatic drain (as on this unit) suits enclosed or unmanned installations, while manual and differential-pressure drains suit attended setups. The 40 um element is the standard grade; specify the W code if you need 5 um. Gauge scale is selectable (MPa, psi or bar) and this unit carries the embedded square gauge in psi. Thread is G (BSPP) here, with PT and NPT available to order; brackets are optional. Flow is published as curves, not a single rated figure, so send us your application details and we will confirm sizing against the datasheet before you order.
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 curves, not as a single rated figure, so we do not quote a flow number. Send us your application details and we will confirm the flow curve and sizing from the datasheet on request.
The A in the code GFR30008ALJF2G specifies an automatic drain: the bowl expels collected condensate on its own, which suits enclosed or unattended installations. The L specifies the low-pressure regulator type, intended for circuits running below standard regulator settings; its exact adjustment range is not published, so we confirm it from the datasheet on request.
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.