The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in 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 holds downstream pressure in a single body. This configuration is the low-pressure type, fitted with a 5 um filter element (code W) for finer filtration than the standard 40 um grade, an automatic drain that ejects collected condensate without manual attention, an external round gauge scaled in psi, and a mounting bracket. The port is PT1/4 (1/4 in, PT thread standard; G and NPT threads are order options). Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C, non-freezing. The polycarbonate bowl suits the 300 size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600 with matching port sizes, a choice of differential-pressure, automatic or manual drain, 40 um standard or 5 um (W) filtration, standard or low-pressure regulation, gauge style and scale, and optional reverse/check valve. Because AirTAC publishes flow only as curves rather than a single rated figure, we confirm flow and datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in 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 | 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. |
| (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. |
| (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) |
Mounted at the drop feeding a small pneumatic press or clamping fixture, it filters the shop air to 5 um and holds a steady low-pressure setting for the cylinder circuit, with the psi gauge giving the operator a direct reading.
On bench rigs and lab equipment that need clean, finely regulated air at modest pressures, the 5 um element protects instruments and the automatic drain keeps condensate off the bench without daily attention.
Fitted ahead of a carton-sealing or wrapping machine's air controls, it removes water and fine particles from the plant supply and regulates the low working pressure the machine's valves and actuators expect.
Size and port step up with required flow: this is the 300 size with a 1/4 in PT port, so check it against the air demand of the circuit it feeds. The 5 um element (W) suits points of use that need finer particulate control than the standard 40 um grade. The automatic drain suits unattended installations; choose manual or differential-pressure drain codes if you prefer operator-controlled or pressure-differential draining. The low-pressure (L) type is intended for circuits that run below standard regulator settings - its exact adjustment range is not published, so confirm it with us. The round psi gauge is fitted here; embedded square gauges with MPa, psi or bar scales are the alternative. PT is the standard thread and G (BSPP) or NPT are order options. A mounting bracket is included.
Flow for this family is published as curves, not a single rating, so ask us to confirm sizing 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 rather than a single rated figure, so we do not quote a rated flow number. Tell us your application and we will confirm the flow and datasheet figures for the GFR300-08 on request before you order.
The A in the code GFR30008ALC2W selects the automatic drain, which ejects collected condensate on its own instead of relying on manual draining, and the W selects the 5 um filter element instead of the standard 40 um grade. Both are standard catalogue options on the GFR family if you need a different combination.
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.