The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4, 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 GFR300-08 is an AirTAC GFR300 filter regulator: water and particulate filtration plus pressure regulation in a single body. This configuration carries a 1/4 in NPT port (PT is the standard thread; G and NPT are order options), a 5 um filter element (the W grade, finer than the 40 um standard), an automatic drain, the low-pressure regulator type, an embedded square gauge reading in psi, and no reverse/check valve or mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The 300-size bowl is polycarbonate (PC).
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, square or round gauges with MPa, psi or bar scales, and PT, G or NPT threads. The exact adjustment range of the low-pressure type is not published in the catalogue; we confirm it, along with flow figures, from the datasheet on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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 — square, 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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. |
| T | NPT 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) |
Feeding the clamping cylinders on a pneumatic press, where the GFR300-08 filters the supply and holds a reduced regulated setting via its low-pressure type regulator, with the automatic drain clearing condensate between cycles.
Supplying filtered, regulated air to the cylinder-driven sealing and sorting heads on a packaging conveyor, so the 5 um element protects downstream valves while the automatic drain keeps the PC bowl clear without operator attention.
Conditioning shop air for bench-top test rigs and lab instruments that need fine 5 um filtration and a stable, reduced supply pressure at the 1/4 in connection, with the psi gauge read directly at the unit.
Size and port set the flow capacity: the GFR300 steps up from GFR200 and below GFR400/600, with this unit carrying a 1/4 in NPT port. Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering. The real decodable choices on this family are: drain type (automatic here; manual and differential-pressure are the alternatives), filter grade (5 um here versus the 40 um standard), gauge (embedded square with psi scale; round gauges and MPa/bar scales are options), thread (PT standard, G and NPT to order) and bracket (not fitted on this code).
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 GFR300 flow as curves, not as a single rated number, so we do not quote a figure here. Send us your application details and we will confirm the flow and sizing from the datasheet on request.
The W code fits a 5 um element instead of the 40 um standard, catching finer particles ahead of the regulated output. The A code adds an automatic drain, so condensate in the PC bowl is expelled without manual bleeding; manual and differential-pressure drains are the other catalogue options.
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.