The AirTAC GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Manual Drain 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a G1/4 (BSPP) port, a 5 um filter element (finer than the standard 40 um grade), a manual drain on the polycarbonate bowl, an embedded square pressure gauge reading in psi, and a fitted reverse (check) valve. It is supplied without a mounting bracket.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200/300/400/600) covering ports from 1/8 to 1 inch with PT, G and NPT thread options. Maximum inlet pressure is 1.0 MPa (145 psi), the regulating range is 0.05-0.9 MPa (7-130 psi), and the working temperature is -5 to 70 C, non-freezing. Flow for this series is published as curves rather than a single rating, so ask us to confirm sizing figures from the datasheet on request.
| Model | GFR300-08 AirTAC Filter Regulator, G1/4, 5 um, Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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) |
Mounted at the drop feeding a CNC machining centre, this unit filters water and swarf-carrying moisture out of the shop air and holds a steady regulated pressure to the machine's pneumatic clamps and tool-change actuators. The 5 um element suits the fine control valves inside the cabinet.
Installed on the air drop serving a carton-sealing or case-erecting conveyor line, it gives the line's pusher and grip cylinders one clean, set-and-forget regulated pressure, while the check valve keeps cylinders from creeping if upstream supply is interrupted.
Fitted ahead of the spray guns in a paint booth, the unit strips water and pipe-scale from the compressed air and lets the operator dial in a consistent gun pressure; the psi gauge sits in the panel where the painter can read it at a glance.
Sizing starts with the port: the 300 size carries a 1/4 in port, one step in a range that runs from 1/8 to 1 inch across sizes 200-600, so step up a size where the application demands more flow. This unit already specifies the 5 um element (the standard grade is 40 um; choose 5 um where downstream valves or instruments need cleaner air), a manual drain (automatic and differential-pressure drains are available if the bowl cannot be emptied by hand), a square gauge in psi (MPa or bar scales, or an external round gauge, are alternatives), and a reverse/check valve. Thread is G (BSPP); PT is the standard and NPT can be ordered. Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing against the datasheet 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 figure, so we do not quote a number here. Send us your application's flow and pressure requirements and we will confirm the sizing figures from the datasheet on request before you order.
The manual drain means the bowl is emptied by hand, which suits stations that are visited regularly; automatic and differential-pressure drain versions are available if the bowl cannot be drained manually. The fitted reverse (check) valve holds downstream pressure if the upstream supply drops, protecting the circuit it feeds.
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.