The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, Auto Drain is a genuine G-series filter regulator: water separation, 40 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 holds downstream pressure in one compact body. This configuration carries a 1/4 in NPT port, a 40 um standard filter element, an automatic drain that ejects collected condensate without manual attention, a round pressure gauge reading in bar, and a built-in reverse (check) valve that holds downstream pressure if the upstream supply is lost. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjusts from 0.15 to 0.9 MPa (20-130 psi), and the polycarbonate bowl suits ambient temperatures from -5 to 70 C (non-freezing). No mounting bracket is included with the J suffix.
This is a genuine AirTAC part. The GFR family is offered in 200, 300, 400 and 600 sizes with ports from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drains, a 5 um element option (code W), embedded square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures against your application.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 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 — round, bar 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". |
| 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Point-of-use preparation for the clean, regulated air feeding tool changers, clamps and actuated doors on a machining centre, with the check valve holding settings during supply dips.
Filtering and regulating the air that drives pick-and-place and carton-sealing cylinders on a packaging conveyor, with automatic drain handling condensate on a line that runs unattended.
Setting consistent operating pressure for pneumatic screwdrivers and press-fit actuators at an assembly cell, with the bar gauge giving the operator a clear local reference.
Start with the port and size: the 300 body with a 1/4 in NPT port is one step in a range that runs from 200 (1/8 and 1/4 in) up to 600 (1 in), so step up a size if your line needs more flow. Choose the drain to match access: automatic (this unit) suits enclosed or infrequently visited installations, manual suits attended points, and differential-pressure is the default. The standard element is 40 um; specify the W option for 5 um where finer filtration is needed. Gauge scale is selectable (MPa, psi or bar) and this code carries an external round gauge in bar. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also orderable. The J suffix means no mounting bracket is supplied.
Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing from 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 G-series flow as curves rather than a single rated figure, so there is no one number we can honestly quote. Tell us your application and we will confirm the relevant flow and datasheet figures for the GFR300 at 1/4 in NPT on request.
A is the automatic drain, J means no mounting bracket is included, C3 is the external round pressure gauge with a bar scale, T is the NPT thread option (PT is the catalog standard and G/BSPP is also orderable), and K means a reverse (check) valve is fitted.
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.