The AirTAC GFR300-08G AirTAC Filter Regulator G1/4, 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 GFR300-08G is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the size 300 unit with a G1/4 (BSPP) port, 5 um filtration (the finer W grade, versus the 40 um standard element), an automatic drain that expels collected condensate without manual attention, and a round pressure gauge reading in psi. The standard regulator adjusts from 0.15 to 0.9 MPa (20-130 psi), maximum inlet pressure is 1.0 MPa (145 psi), and the polycarbonate bowl suits non-freezing air from -5 to 70 C.
This is a genuine AirTAC part. The GFR series is also available in sizes 200, 400 and 600 with larger ports, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, gauge scale options, and G or NPT thread variants. Because flow is published as curves rather than a single rating, we confirm the datasheet and flow figures for your application on request.
| Model | GFR300-08G AirTAC Filter Regulator G1/4, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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. 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. |
|---|---|
| 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| (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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Clean, regulated air at a machine tool's air preparation point, where the 5 um element protects solenoid valves on clamps and tool changers and the psi gauge gives operators a direct setpoint readout.
A filter regulator feeding pneumatic pushers and diverters on a packaging conveyor, with the automatic drain keeping condensate out of the circuit on a line that runs unattended between shifts.
Point-of-use preparation for air cylinders and grippers at an assembly workstation, combining water and particle removal with a stable regulated pressure set locally on the psi gauge.
Size 300 with a G1/4 port is a common step for point-of-use drops and compact machine supplies; step up to size 400 or 600 where the line feeds several actuators at once. The 5 um element on this unit is the right choice when downstream valves and cylinders are sensitive to finer particles; the 40 um standard grade suits general protection. The automatic drain suits unattended or hard-to-reach installations, while manual and differential-pressure drains remain available in the series. Gauge scale (MPa, psi or bar) and thread (PT standard, G or NPT to order) are selected at ordering; this unit has no mounting bracket (code J).
For sizing, treat flow honestly: AirTAC publishes flow as curves, not a single rated figure, so tell us your application and we will confirm the correct size 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 the GFR series as curves rather than a single rated figure, so we do not quote a rated flow number. Send us your application details and we will confirm the flow data from the datasheet so you can size the unit correctly before ordering.
The automatic drain (code A) discharges collected condensate from the polycarbonate bowl by itself, so the unit does not need periodic manual draining. The 5 um filtration grade (code W) is the finer element option; the series' standard grade is 40 um, so this unit is specified where finer particle removal matters.
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.