The AirTAC GFR300-08 AirTAC Filter Regulator PT1/4 Low-Pressure 5um 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 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 built on the 300 size with a PT1/4 (1/4 in) port in PT thread, the low-pressure regulator type, a 5 um filter element (the finer of the two published grades), an automatic drain, a square pressure gauge reading in psi, and an integrated reverse/check valve. A mounting bracket is included, and the polycarbonate bowl suits the non-freezing -5 to 70 C operating range, with maximum inlet pressure of 1.0 MPa (145 psi).
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in and PT, G (BSPP) or NPT threads. Bowls on sizes 200-400 are polycarbonate; size 600 uses aluminium alloy. Rated flow is published as curves rather than a single figure, so ask us to confirm sizing and any datasheet value against your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator PT1/4 Low-Pressure 5um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT 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 | 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". |
| 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. |
| (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. |
| 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) |
Supplying filtered, low-pressure regulated air to the clamp and swing cylinders on a CNC milling or turning fixture, where the part must be held at a set pressure below the standard regulator range.
Conditioning the air feeding small actuators and grippers on a filling or cartoning line, with the 5 um element helping protect sensitive valves and the auto drain handling condensate through shift cycles.
Providing clean, regulated air at low setpoints to a pneumatic test rig or lab bench, where the psi gauge, check valve and bracket-mounted installation suit a fixed instrument panel.
Pick the size and port step (200/300/400/600; 1/8 in to 1 in) against the flow your line needs - we confirm sizing from the published flow curves on request. Drain options are differential-pressure (default), automatic (as fitted here) and manual. Filter grade is 40 um standard or 5 um with the W code, as on this unit. Gauge scales are MPa, psi or bar, with an embedded square gauge standard and an external round gauge optional. Thread is PT as standard with G (BSPP) and NPT as order options, and a bracket is included. This is the low-pressure regulator type; its exact adjustment range is not published, so confirm your setpoint with us before ordering.
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.
Flow for the GFR300 is published as curves, not as a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the flow curves and sizing from the AirTAC datasheet on request before you order.
This GFR300-08 is the low-pressure regulator type, a build option for circuits that call for lower setpoints than the standard type. The exact adjustment range for the low-pressure type is not published in the catalogue, so tell us your setpoint and we will verify suitability on request.
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.