The AirTAC GFR300-08 AirTAC Filter Regulator 1/4 in NPT, Low-Pressure 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 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: it removes water and particulate from compressed air and holds downstream pressure at a setpoint, in a single body. This configuration is the 300 size with a 1/4 in NPT port, a manual-drain bowl in polycarbonate, a 40 um standard filter element and the low-pressure regulator type. An embedded square gauge scaled in psi is fitted, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR300 series is one of four sizes (200, 300, 400, 600) with port options from 1/8 to 1 in and PT, G or NPT threads, plus drain, filter grade, gauge scale and bracket choices to match the unit to your line. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | GFR300-08 AirTAC Filter Regulator 1/4 in NPT, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (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. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Set a gentle, stable supply pressure for glue heads, spray guns or coating nozzles on a packaging or finishing line, with the 40 um element catching pipe scale ahead of the downstream valves.
Install as the single filter-regulator stage in a machine control panel feeding air logic valves and low-pressure actuators, with the square psi gauge visible for setpoint checks during commissioning.
Regulate low-pressure air to spinning, weaving or web-cleaning jets, where the manual-drain bowl is emptied as part of scheduled shift maintenance on the machine.
Size and port step up with demand: 200, 300, 400 and 600 bodies cover 1/8 to 1 in ports, so choose the size whose flow curve covers your air consumption at working pressure. Drain type matters: this unit has a manual drain, so an operator empties the bowl; select the automatic or differential-pressure versions where unattended drainage is needed. Filter grade is 40 um standard, with the W variant giving 5 um finer filtration. The low-pressure (L) regulator type suits circuits set well below standard ranges - confirm the setpoint band with us before ordering. Thread here is NPT; PT is the standard and G or NPT are order options. The gauge is the embedded square type scaled in psi, with MPa or bar scales available. Flow is published as curves, not a single rated figure, so ask us to confirm sizing against the 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 this series as curves, not a single rated figure, and we will not quote an invented number. Send us your working pressure and air consumption and we will confirm the datasheet flow figures for the GFR300-08 on request.
In the code GFR300-08MLF2T, M is the manual-drain bowl, L is the low-pressure regulator type, F2 is the embedded square gauge scaled in psi and T is the NPT thread. If you would rather not drain the bowl by hand, ask us about the automatic or differential-pressure drain versions.
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.