The AirTAC GFR300-08 AirTAC Filter Regulator 1/4" PT, 5 um, Auto 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 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 300-size filter regulator that cleans compressed air and sets downstream pressure in a single body. This configuration carries a 1/4 in PT port, a 5 um filter element (the fine W grade, versus the 40 um standard), an automatic drain that expels collected condensate without manual attention, and an embedded square gauge reading in psi. The standard regulator adjusts outlet pressure across 0.15-0.9 MPa (20-130 psi) with automatic or differential-pressure drainage, the unit tolerates a maximum inlet pressure of 1.0 MPa (145 psi), and it operates from -5 to 70 C in non-freezing conditions. The polycarbonate bowl suits this size, and no mounting bracket is fitted.
This is a genuine AirTAC part from the GFR300 series. The GFR line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and offers manual, automatic or differential-pressure drains, 40 um or 5 um elements, square or square-less gauge arrangements with MPa, psi or bar scales, and PT, G or NPT threads. Flow for this series is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator 1/4" PT, 5 um, Auto Drain |
|---|---|
| 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 | 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 | Automatic 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". |
| A | Drain: Automatic 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. |
| (blank) | PT 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) |
Prepares the shop-air feed to a CNC machining centre: the 5 um element removes water and fine particulate before air reaches tool-change actuators and clamps, while the regulator holds a steady set pressure and the psi gauge lets operators verify the setting at a glance. The automatic drain keeps condensate off the machine without daily bowl checks.
Sits in the air drop feeding the pneumatic cylinders on a packaging or cartoning conveyor. Clean, regulated air keeps pick-and-place and sealing motions repeatable through the shift, and the automatic drain suits a line that runs unattended, with the 1/4 in PT port matching typical drop-leg tubing.
Placed at the spray-gun take-off in a paint finishing booth, where the 5 um grade limits water and particle carry-over into the finish and the regulator sets the gun supply pressure using the psi gauge. The polycarbonate bowl allows a visual check of collected condensate between drains.
Choose the GFR size by port step and required flow: this 300-size unit takes a 1/4 in PT port, one step up from the 200 series and below the 400 and 600 sizes. Pick the drain to match the installation: automatic drain (this unit) suits unattended duty, manual drain suits periodically checked points, and the differential-pressure default drains on load change. Select the 5 um W element where downstream equipment needs finer filtration than the 40 um standard, and set the gauge scale to psi (this unit), MPa or bar. PT is the standard thread; G and NPT are order options. A bracket is optional, and this code specifies none.
Because flow for the GFR series is published as curves rather than a single rated figure, we cannot quote one number here. Ask us to confirm the datasheet and check the curve against your air demand before ordering.
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 series as curves, not as a single rated figure, so we do not quote a number here. Tell us your inlet pressure and the air demand of your equipment, and we will confirm the curve and datasheet figures for the GFR300-08 on request before you order.
The A in the code GFR30008AJF2W specifies an automatic drain, which expels collected condensate from the bowl on its own instead of waiting for a manual bleed - useful on unattended or continuously running equipment. The trailing W specifies the 5 um filter element, a finer grade than the 40 um standard, chosen where downstream valves, cylinders or spray equipment need cleaner air. Both are factory build options on the same GFR300 body.
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.