The AirTAC AirTAC GFR300-08 Filter Regulator, G1/4, Auto Drain 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 GFR300-08 is an AirTAC GFR-series filter regulator: filtration and pressure regulation combined in a single body. It removes water and particulate from compressed air and lets you set a stable downstream pressure, in this 300 size with a 1/4 in G-thread port. This configuration carries an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, a round pressure gauge reading in psi, a reverse/check valve to hold the set pressure if the upstream supply drops, and a mounting bracket. The polycarbonate bowl is standard at this size. Maximum inlet pressure is 1.0 MPa (145 psi), the regulation range is 0.15-0.9 MPa (20-130 psi), and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with matching port sizes, and is available with manual or differential-pressure drains, a 5 um element (code W), square or round gauges in MPa, psi or bar scales, and G or NPT threads as order options. Rated flow is published as curves rather than a single figure, so ask us and we will confirm the datasheet numbers for your application on request.
| Model | AirTAC GFR300-08 Filter Regulator, G1/4, Auto Drain |
|---|---|
| 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 | 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 | 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. 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. |
| (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. |
| (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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Mounted at the air inlet of a machining centre's pneumatic cabinet, it strips water and swarf-laden particulate before the supply reaches solenoid valves and tool-clamp cylinders, and holds the set pressure the clamping circuit was designed around. The reverse/check valve keeps the setting if the shop supply dips.
At individual assembly-line stations feeding impact drivers, nut runners and clamping fixtures, it conditions the drop-air and regulates it to the pressure the tools and fixtures are set up for, with the automatic drain clearing condensate on a line that runs across shifts.
On a cartoning or case-packing conveyor, it feeds the machine's directional valves and pusher cylinders with filtered, regulated air, protecting the valve spools from water and grit while the psi gauge lets the line technician verify setting at a glance.
Step through the decodable choices before ordering. Size and port: 200, 300, 400 and 600 step up in port and flow capacity, so match the 1/4 in G-thread port here to your line size and required air demand. Drain: automatic (this unit) suits unattended duty; manual and differential-pressure drains are the other catalogue choices. Filter grade: 40 um is standard and 5 um (code W) is available when finer particulate removal is needed. Gauge: this model has a round gauge in psi; square embedded gauges and MPa or bar scales are alternatives. Thread: G is fitted here, with PT standard and NPT as order options. A bracket is included, and the reverse/check valve (code K) is fitted. Because flow is published as curves rather than a single rating, 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes GFR flow as curves rather than a single rated figure, so there is no one l/min or SCFM number we can honestly quote. Tell us your application and air demand and we will confirm the relevant datasheet curve and sizing for you on request.
The A in the code GFR30008AC2GK specifies an automatic drain, which expels collected condensate without anyone opening the bowl - useful on unattended or multi-shift equipment. The catalogue alternatives are manual drain (code M) and the differential-pressure drain, which is the default when no drain letter appears in the code.
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.