The AirTAC GFR300-08 AirTAC Low-Pressure Filter Regulator 1/4 PT 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 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 AirTAC GFR300-08 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is the low-pressure (L) type for circuits that need a lower regulated setpoint than the standard version, with a 5 um filter element (code W), a manual drain on the polycarbonate bowl, a reverse/check valve fitted, and no mounting bracket (code J). The embedded square gauge is supplied with a psi scale, and an external round gauge is available as an option. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes covering ports from 1/8 to 1 inch, with PT as the standard thread and G (BSPP) or NPT as order options, a choice of 40 um or 5 um filtration, and manual, automatic or differential-pressure drains. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-08 AirTAC Low-Pressure Filter Regulator 1/4 PT |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT thread) |
| Filtering grade | 5 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 | 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. 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. |
| 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. |
| (blank) | PT 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a machining fixture that clamps workpieces with air cylinders running at reduced pressure, this filter regulator cleans the supply and holds the lower setpoint the low-pressure type is built for, with the check valve holding the circuit against backflow.
Feeding benchtop pneumatic test rigs and lab instruments that require clean, low-pressure air, the 5 um element removes fine particulate and water while the psi-scaled gauge gives a direct readout at the panel.
On a carton-sealing or wrapping conveyor where actuators run at reduced pressure for gentle handling, this unit filters the shop air, regulates it down in one body, and the manual drain suits a line with scheduled shift checks.
Start with the port step: this unit is 1/4 in PT in the 300 size; step up or down a size if your line port or air demand differs, and ask us to check the published flow curves against your consumption before ordering. Choose the drain to suit maintenance: manual (this unit) needs periodic draining by hand, while automatic or differential-pressure drains suit unattended installations. Pick the 5 um element (this unit) where finer particulate removal matters, or the 40 um standard for general protection. Gauge scale is selectable (MPa, psi or bar); this unit ships with the embedded square gauge in psi. PT is the standard thread with G and NPT as order options, and a mounting bracket can be added if this no-bracket (J) configuration needs one. Because this is the low-pressure type, confirm your required regulated setpoint with us; the exact regulation range for the L type is not published in the catalogue. Flow is published as curves, not a single rating, so let us confirm sizing against your application 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 flow for the GFR series as curves, not as a single rated number, so we do not quote a figure here. Send us your line pressure, port size and air consumption and we will confirm the flow from the datasheet curves for your application on request.
The M in the code specifies a manual drain: accumulated water is released by hand, which suits installations with regular maintenance rounds. The same GFR300-08 body is available with an automatic drain (code A) or the differential-pressure drain (no code) if you prefer unattended moisture removal.
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.