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 holds downstream pressure steady in a single body. This configuration carries a G1/4 (BSPP) port, a 5 um filter element for finer filtration than the 40 um standard, a manual drain on the PC bowl, an embedded square gauge reading in psi, and a built-in reverse (check) valve that holds downstream pressure if the supply drops. The regulator adjusts from 0.05 to 0.9 MPa (7 to 130 psi), maximum inlet pressure is 1.0 MPa (145 psi), and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part in the GFR300 series. The GFR line spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, a choice of manual, automatic or differential-pressure drains, 40 um or 5 um filtration, gauge scales in MPa, psi or bar, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm datasheet figures for your application before ordering.
| 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. |
| (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. |
| 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 clean, regulated air to a CNC machining centre's pneumatic tool-clamp and chip-clearing circuits, where the 5 um element guards fine valves and the regulator holds a steady clamp pressure.
Supplying regulated air to the pick-and-place cylinders and stopper gates on a packaging conveyor, with the manual drain bled at shift-change maintenance and the check valve holding cylinder position if the supply dips.
Conditioning air at the drop to a paint-spray booth's spray guns: the 5 um element and water removal help limit finish defects while the regulator sets the gun atomising pressure.
Size and port set the flow path: this unit is the 300 body with a G1/4 port; the 200 body with 1/8 or 1/4 inch ports covers lighter duty, while the 400 and 600 bodies with 1/2 to 1 inch ports step up for higher air demand. Drain choice matters: manual drain means an operator opens the bowl drain during maintenance, while automatic and differential-pressure drains discharge condensate without attention - pick manual only where a drain routine exists. This unit carries the 5 um element (code W); the 40 um standard element suits general lines, and 5 um protects finer downstream equipment. The square gauge reads psi; MPa and bar scales are available, and an external round gauge is optional. Thread is G (BSPP) here; PT is the standard offering and NPT is an order option. A mounting bracket is included. Flow for this family is published as curves, not a single rating, so ask us to confirm sizing against your air demand 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 a single rated figure, so we do not quote a number here. Tell us your line pressure and the air demand of your equipment and we will confirm from the datasheet whether the GFR300-08 at G1/4 is correctly sized before you order.
M means a manual drain: condensate collects in the PC bowl and an operator opens the drain fitting to release it. If you cannot guarantee a drain routine, the automatic-drain version discharges condensate on its own, and differential-pressure drain is the catalogue default. All three options fit the same GFR300-08 envelope.
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.