The AirTAC GFR300-08 AirTAC Filter Regulator PT1/4 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 GFR300-08 is an AirTAC GFR-series filter regulator: filtration and pressure regulation combined in one body. This size 300 unit has a PT1/4 (1/4 in) port, a 40 um standard filter element that removes water and particulate from compressed air, and an automatic drain that expels collected condensate without manual attention. Pressure is set within the 0.15-0.9 MPa (20-130 psi) regulation range, a round external gauge reading in psi is fitted, and a reverse/check valve is installed to hold downstream settings if supply pressure is lost. No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600 with a choice of ports, PT/G/NPT threads, 40 um or 5 um elements, differential-pressure, automatic or manual drains, and gauge options. Flow for this unit is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures against your application on request.
| Model | GFR300-08 AirTAC Filter Regulator PT1/4 Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (PT 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, 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". |
| 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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) |
Feeds clean, regulated air to the pneumatic clamps and workholding fixtures on a machining centre, with the check valve helping hold the clamp setting if shop-air supply dips.
Supplies filtered, pressure-set air to the cylinders and grippers on a carton packing conveyor, with the automatic drain clearing condensate on a line that runs unattended.
Conditions the air feeding solenoid valves and small actuators at a bench assembly station, keeping water and particulate out of the valve stack at a set working pressure.
Size 300 with a PT1/4 port sits in the middle of the GFR range; step up to size 400 or 600, or down to size 200, as your line's flow demand dictates - we can confirm the flow curves for each size before you order. This unit carries the 40 um standard element; choose the W option for a 5 um element if downstream valves or instruments need finer filtration. The automatic drain suits unattended installations; manual or differential-pressure drains are available as alternative codes. The fitted round gauge reads in psi; square embedded gauges and MPa or bar scales are the other catalogue options. PT is the standard thread on this code, with G (BSPP) and NPT available to order. Note that no mounting bracket is included with the J option.
Because catalogue 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 figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application and we will confirm the datasheet flow figures for this unit on request.
The A in the code GFR30008AJC2K specifies an automatic drain, which expels collected condensate without anyone having to open the bowl - useful on lines that run unattended. Manual (M) and differential-pressure (blank) drain versions are available as separate catalogue codes if you prefer a different arrangement.
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.