The AirTAC GFR300-08G AirTAC Filter Regulator 1/4 in, 5 um, psi Gauge 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 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 AirTAC GFR300-08G is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This 300-size unit is fitted with a G1/4 (BSPP) port, a 5 um filter element for finer filtration than the standard 40 um grade, a differential-pressure drain that bleeds condensate automatically as flow passes through, and an embedded square gauge reading in psi. The standard regulator covers an adjustment range of 0.15-0.9 MPa (20-130 psi), with a maximum inlet pressure of 1.0 MPa (145 psi) and an operating temperature of -5 to 70 C (non-freezing). The polycarbonate bowl suits this size, and a mounting bracket is included.
This is a genuine AirTAC part. The GFR family is available in 200, 300, 400 and 600 sizes with port sizes from 1/8 to 1 inch, and options include automatic or manual drains, a 5 um element, alternative gauge scales (MPa, psi or bar), a reverse/check valve, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-08G AirTAC Filter Regulator 1/4 in, 5 um, psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 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 — 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. 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. |
|---|---|
| 08 | Port size PT1/4". 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). |
| 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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Point-of-use conditioning for the air feeding a machining centre's pneumatic tool clamps and tool-change actuators: the 5 um element protects the valves from fine particulate and carryover water, while the regulator sets a stable working pressure at the machine.
Conditioning the air supply to carton-sealing and diverting cylinders on a packaging conveyor, where the differential-pressure drain keeps condensate moving out during continuous flow and the psi gauge lets line staff verify set pressure at a glance.
Filtering and regulating the air that actuates booth dampers, spray-gun triggers and fixture clamps in a finishing line, where the finer 5 um grade helps keep contaminants out of the air driving equipment in a clean-critical area.
Size and port step up together: 200, 300, 400 and 600 cover progressively larger ports and higher flow, so match the size to the air demand of the circuit rather than to the pipe alone. This unit is already configured with the finer 5 um element - choose it where downstream valves, cylinders or instruments are sensitive to finer particulate; the standard grade is 40 um. The differential-pressure drain handles condensate automatically during flow; choose an automatic drain for unattended duty or a manual drain where you want positive operator control. The embedded square gauge reads in psi, with MPa or bar scales available, and an external round gauge is an option. Thread is G (BSPP) here; PT is the standard catalogue thread and G or NPT are order options. A mounting bracket is included.
One honest note on sizing: AirTAC publishes flow for this family as curves, not as a single rated number, so we do not quote a flow figure here. Send us your application details and we will confirm the sizing against the datasheet curves before you order.
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 family as performance curves, not as a single rated figure, so we do not quote a flow number here. Send us your application - required downstream demand and working pressure - and we will confirm the sizing against the datasheet curves before you order.
The blank drain position in the code means the differential-pressure drain, which is the default for this family: condensate is discharged automatically as air flows through the unit, with no operator action and no separate timer. If your application stands idle for long periods or runs unattended, an automatic-drain version (code A) or a manual-drain version (code M) can be ordered in the same size.
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.