The AirTAC GFR300C08MLF3WT AirTAC Filter Regulator NPT 1/4 in, 5 um 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 See datasheet ports, a differential-pressure 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 GFR300C08MLF3WT is an AirTAC GFR-series filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This size 300 unit is configured with a 1/4 in NPT port, a 5 um filter element (the finer of the two catalogue grades), a manual drain on the metal bowl, and the low-pressure regulator type. An embedded square gauge with a bar scale is fitted, and a mounting bracket is included. Maximum working (inlet) pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with a choice of port sizes, PT, G or NPT thread, differential-pressure, automatic or manual drains, 40 um or 5 um elements, gauge style and scale, and standard or low-pressure regulation. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR300C08MLF3WT AirTAC Filter Regulator NPT 1/4 in, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — factory standard, Factory standard 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. |
|---|---|
| C0 | Port size See datasheet. This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure 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). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Feeding the pneumatic cylinders on a carton-forming and sealing machine with air that is free of water and fine particulate, held at the low set pressure the cylinder circuit was designed around.
A filtered, regulated take-off point on a lab or pilot-plant compressed-air ring main, where the 5 um element protects sensitive pneumatic instruments and the bar-scale gauge gives a local pressure reading.
A workbench air drop for hand-held pneumatic tools and fixtures at an assembly station, with the manual drain purged during end-of-shift checks and the bracket fixing the unit to the bench frame.
Size and port set the capacity envelope: this unit is size 300 with a 1/4 in NPT port; step up to size 400 or 600 where the line needs more flow, or down to size 200 for compact points of use. The 5 um element (code W) suits applications that need finer particulate capture than the 40 um standard grade. The manual drain means an operator opens the bowl drain periodically, which suits positions that are checked during routine rounds; automatic or differential-pressure drains are available on other variants where unattended purging is preferred. The low-pressure regulator type is intended for lower set-pressure duties; its exact adjustment range is not published, so confirm it with us before ordering. The fitted square gauge reads in bar; round gauges and MPa or psi scales are catalogue options. PT is the standard thread and G or NPT are order options - this unit is built with NPT. A mounting bracket is included.
Because flow is published as curves and not as a single rated number, 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 there is no one rated flow number we can honestly quote. Tell us your inlet pressure, set pressure and expected air demand, and we will confirm the flow from the datasheet and check the sizing against your application on request.
The code W in the model selects the 5 um filter element, the finer of the two catalogue grades (40 um is standard), for applications that need cleaner air downstream. The M selects a manual drain, so condensate is emptied by opening the bowl drain during routine checks; automatic and differential-pressure drain variants are available if you prefer unattended purging.
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.