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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This size 300 unit has 1/4 in NPT ports, a 40 um standard filter element, an automatic drain that ejects collected condensate without manual attention, a round external gauge reading in psi, and a built-in reverse/check valve that holds downstream settings if supply pressure is lost. A mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the standard regulator adjusts from 0.15 to 0.9 MPa (20-130 psi). Operating temperature is -5 to 70 C (non-freezing), and the polycarbonate bowl suits transparent level checking.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200/300/400/600) with port options from 1/8 to 1 in and PT, G or NPT threads. Drain type, filter grade (40 um standard, 5 um optional), gauge style and scale, and reverse valve are all selectable. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| 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, 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. |
| (blank) | Mounting bracket included. |
| (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. |
| 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) |
Feeding clean, regulated air to a machining centre's pneumatic tool clamps and chip-clearing blasts, with the check valve holding the set pressure if the shop supply dips mid-cycle.
Conditioning the air feeding conveyor stopper cylinders and carton-forming actuators on a packaging line, where the automatic drain keeps condensate out of the valves during long unattended runs.
Installed at the drop leg of an assembly cell so cylinders and air tools receive filtered, pressure-regulated air, with the psi gauge giving operators a local set-point reference.
Size 300 with 1/4 in NPT ports suits lines where the required flow sits in the middle of the G-series range; step up to size 400 or down to size 200 if your flow curve demands it. The automatic drain on this unit is the right choice when the bowl is mounted where regular manual draining is impractical; manual and differential-pressure drains are available as alternatives. The 40 um element is the standard grade for general plant air; specify 5 um (code W) only where finer filtration is genuinely needed. The round psi gauge is fitted here; embedded square gauges and MPa or bar scales are options. NPT thread is ordered as an option - PT is the catalogue standard, and G (BSPP) is also available. A bracket is included with this configuration.
Because flow is published as curves rather than a single rated figure, we cannot quote one number here. Send us your flow and pressure requirements 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 GFR300 series as curves, not as a single rated figure, so we do not quote a number here. Tell us your required flow and working pressure and we will confirm the correct size against the datasheet on request before you order.
This configuration carries code A, the automatic drain, which ejects collected condensate from the bowl without manual attention. The GFR300 series is also available with a manual drain (code M) or the differential-pressure drain (blank code) if you prefer to drain on schedule or with pressure drop.
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.