The AirTAC GFR300-08 AirTAC Filter Regulator 1/4" PT 5 um Auto Drain 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 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 size-300 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 5 um filter element (the finer of the two published grades), an automatic drain that ejects collected condensate without manual attention, and a low-pressure regulator type for circuits set below standard working ranges. It is fitted with an external round gauge scaled in psi, a reverse/check valve, and includes a mounting bracket. The 1/4 in PT port is the standard thread; G (BSPP) and NPT are order options.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with matching port sizes, and options include drain type (differential-pressure, automatic or manual), 40 um or 5 um filtration, gauge style and scale, a reverse/check valve, and bracket choice. 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 | GFR300-08 AirTAC Filter Regulator 1/4" PT 5 um Auto Drain |
|---|---|
| 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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) |
Feeds filtered, regulated air to the directional-valve manifold of a carton-forming and sealing station, where the low-pressure setting and 5 um element protect the valves and keep condensate out of the actuation circuit.
Conditions the air feeding a pick-and-place robot's gripper actuators, holding a reduced, stable supply pressure set below standard line pressure so delicate parts are handled without over-clamping.
Supplies the blow-off nozzles that clear dust and loose debris from products travelling along a conveyor, with the automatic drain and 5 um filtration keeping moisture and particles out of the nozzles.
Size and port step up together: 200 through 600, with port from 1/8 in to 1 in, so pick the size whose flow curve covers your demand with margin - we can check the curve against your consumption on request. Drain choice here is automatic; differential-pressure (default) and manual are also available in the family. Filtration is 5 um on this unit; 40 um is the standard grade if your circuit does not need the finer element. Gauge options are the embedded square gauge or an external round gauge, scaled in MPa, psi or bar - this unit has a round psi gauge. Thread is PT as standard with G (BSPP) and NPT as order options, and the bracket is included (a no-bracket J variant exists). Note this is the low-pressure regulator type; its exact adjustment range is not published, so confirm it with us 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 G-series flow as curves, not as a single rated number, so we do not quote a l/min or SCFM figure for this unit. Send us your application's flow and pressure requirements and we will confirm the sizing against the datasheet curve before you order.
The code decodes it: W is the optional 5 um grade (40 um is standard) for circuits that need finer particulate removal, and A is the automatic drain, which discharges collected condensate on its own instead of relying on the differential-pressure drain or manual draining. Both are catalogue options across the GFR family, so you can order the 40 um or manual-drain variant if it suits the installation better.
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.