The AirTAC GFR300C08ALJF2 AirTAC Filter Regulator 1/4 in PT 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 See datasheet 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 GFR300C08ALJF2 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and reduces pressure to the working level, in a single body. This size 300 unit is configured with a 1/4 in PT (BSPT-type) port, a 40 um standard filtration grade, an automatic drain that expels collected condensate from the metal bowl without manual attention, and an embedded square gauge reading in psi. It is the low-pressure regulator type, so it suits circuits that run at reduced working pressure rather than full line pressure.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600, with port sizes from 1/8 in to 1 in, optional 5 um filtration (code W), a choice of automatic, manual or differential-pressure drain, gauge scales in MPa, psi or bar, and G or NPT thread options to order. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR300C08ALJF2 AirTAC Filter Regulator 1/4 in PT |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Standard 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 — factory standard, Factory standard 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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. |
|---|---|
| C0 | Port size See datasheet. 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
On a machining fixture with pneumatic clamps, the unit filters plant air and holds a reduced, stable working pressure to the clamp cylinders, with the psi gauge giving the operator a direct reading at the setpoint.
Ahead of the pick-and-place and carton-forming cylinders on a packaging conveyor, the filter regulator cleans the air and steps line pressure down to what the actuators need, while the automatic drain clears condensate without a daily walk-round.
Feeding low-pressure pneumatic bench apparatus or instrument panels, the unit conditions the shop air supply and lets the technician dial in and read a reduced pressure in psi without touching the main line regulator.
Size 300 with a 1/4 in PT port sits in the middle of the GFR range; step up to size 400/600 or down to size 200 according to the flow your circuit needs, decoded from the two-digit port code (06 to 25). This configuration carries the 40 um standard element; choose code W for 5 um where finer particulate protection matters. The automatic drain is the hands-off choice for condensate removal, while manual and differential-pressure drain variants exist in the family if you prefer operator control or pressure-differential purging. The fitted square gauge reads psi; MPa and bar scales and an external round gauge are alternatives. PT is the standard thread on this unit, with G (BSPP) and NPT available as order options, and this code is supplied without a mounting bracket.
Because flow is published as curves and not as a single rating, and this is the low-pressure regulator type whose adjustment range is not a single published figure, ask us to confirm sizing and the adjustment range 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 flow for the GFR series as curves, not as a single rated figure, so we do not quote a number here. Send us your application details - supply pressure, working pressure and the equipment downstream - and we will confirm the flow and sizing from the datasheet on request.
The automatic drain expels condensate collected in the metal bowl without anyone having to open it, which suits installations that are not checked daily. Within the GFR family you can also order a manual drain or a differential-pressure drain; this particular code is the automatic-drain configuration.
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.