The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, 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 AirTAC GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 300 size with a G1/4 (BSPP) port, a manual drain bowl in polycarbonate, the standard 40 um filter element, and the low-pressure regulator type for circuits that run at reduced setpoints. An external round gauge scaled in psi is fitted, and a mounting bracket is included for panel or wall fixing.
This is a genuine AirTAC part from the GFR filter-regulator line, which spans the 200, 300, 400 and 600 sizes with a choice of ports, threads (PT standard; G and NPT to order), drain types, filter grades and gauge options. Flow figures are published as curves rather than a single rating, so we confirm datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator, G1/4, Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) 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 — 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". |
| 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). |
| C | Gauge shape: Round. 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. |
| G | G (BSPP) 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) |
Feeds filtered, regulated air to clamp cylinders on a CNC fixture circuit, with the low-pressure regulator holding a reduced setpoint for delicate workholding and the psi gauge giving the operator a direct pressure readout.
Installed at the drop of a packaging machine's air supply to strip water and debris before directional valves and actuators, with the manual drain bled at shift start and the included bracket fixing the unit to the machine frame.
Used as the point-of-use filter regulator on textile machinery air drops, protecting solenoid valves and air jets from condensate and particles while the low-pressure type matches circuits specified below standard line pressure.
Size and port step up with flow demand: within the GFR line, 200, 300, 400 and 600 cover progressively larger ports, so pick the step that matches your line's air demand. For this 300-size unit the G1/4 BSPP port is fixed by the code; PT is the standard thread and G or NPT are order options. The manual drain suits installations where an operator bleeds the bowl on a routine; choose automatic or differential-pressure drain codes if the unit sits where manual draining is impractical. The 40 um element is the standard grade; specify W for the 5 um element where finer filtration is needed. Gauge scale (MPa, psi or bar) and bracket options are selectable across the range. Because flow is published as curves rather than a single rated figure, 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's air demand and set pressure and we will confirm the sizing from the datasheet curves on request before you order.
The M in the code specifies a manual drain: condensate collected in the polycarbonate bowl is released by operating the drain by hand, which suits stations visited during routine checks. The L in the code specifies the low-pressure regulator type, intended for circuits that run at reduced setpoints; its exact regulation range is not published in the material we hold, so we confirm it on request. The fitted round gauge is scaled in psi.
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.