The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Square 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 GFR300-08 is a 300-size filter regulator that removes water and particulate from compressed air and controls downstream pressure in a single body. This configuration carries a G1/4 (BSPP) port, a fine 5 um filter element (the W grade, against the 40 um standard), a differential-pressure drain that bleeds condensate automatically as flow passes through, and a built-in square gauge scaled in psi. A reverse/check valve is fitted, and the unit is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjusts from 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits the 300 size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes with port options from 1/8 to 1 inch, PT as the standard thread and G or NPT as order options, plus a choice of drain type, filter grade, gauge scale and bracket. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing figures for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Square 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 | 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. 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. |
| 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. |
| G | G (BSPP) 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) |
Feeding a machining centre's clamping fixtures and tool-change cylinders: the 5 um element protects precision valves from particulate and the regulator holds a steady clamp pressure, read directly on the psi square gauge.
Supplying the air cylinders on a packaging conveyor that drive product diverters, pushers and sealing jaws, where the check valve holds the set pressure against back-flow and the differential-pressure drain keeps condensate off the line.
A point-of-use filter regulator at an assembly bench drop, giving each operator clean, regulated air for air screwdrivers and small actuators without needing a separate filter and regulator in the line.
Size and port set the flow capacity: the 300 size with a 1/4 in port sits in the middle of the GFR range (200/300/400/600), so step up or down according to the air demand of the circuit. The 5 um element in this unit is the right choice where downstream valves, cylinders or instruments need finer filtration than the 40 um standard. Drain type matters: differential-pressure (this unit) needs no attention while air flows, automatic drains continuously, and manual drain requires periodic bleeding - and note the regulation range differs by drain type. The embedded square gauge scaled in psi is fitted here; an external round gauge with MPa, psi or bar scale is available instead. PT is the standard thread; G (BSPP, as on this unit) and NPT are catalogue options to order. A mounting bracket can be added if the unit is not this no-bracket (J) version.
Because flow is published as curves rather than a single rating, 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. 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 l/min or SCFM figure. Tell us your application and we will confirm the flow and sizing data from the datasheet on request.
The W code in GFR30008JF2WGK specifies the 5 um filter grade instead of the 40 um standard, for finer protection of downstream equipment. The K code specifies a reverse/check valve fitted on the outlet. Both are catalogue options on the GFR family, as are drain type, gauge scale and thread.
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.