The AirTAC GFR300-08 AirTAC Filter Regulator, NPT1/4, 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 size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration carries a 5 um filter element (the finer of the two published grades), an automatic drain that expels collected condensate without manual attention, and the low-pressure regulator type for circuits that run below standard regulating ranges. The outlet is NPT1/4 (1/4 in) and the unit comes with an external round pressure gauge scaled in MPa; no mounting bracket is included.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in and PT, G or NPT threads. Filter grade, drain type, gauge style and scale are all orderable options. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator, NPT1/4, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Low-pressure 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, MPa 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure 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. |
| 1 | Gauge scale: MPa. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT 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) |
Feeding clean, regulated air to the tool-change and clamping circuits of a CNC machining centre, where the 5 um element protects fine spool valves and the low-pressure regulator type suits circuits specified below standard regulating ranges.
Conditioning the air feeding cylinders and grippers on a carton-forming and sealing line, with the automatic drain keeping condensate out of the bowl during continuous shifts so the line runs without manual drain rounds.
Supplying filtered, regulated air to bench-top analytical or test instruments that specify a clean 1/4 in NPT air inlet, where the round MPa gauge gives a clear local pressure readout at the point of use.
Choose the size and port step against the air demand of the circuit: this unit is size 300 with a 1/4 in NPT outlet, and the GFR range steps up through sizes 400 and 600 with larger ports for higher demand. Drain type is a real choice: automatic (as fitted here) empties the bowl on its own, while manual and differential-pressure drains suit attended or duty-based maintenance routines. Filter grade is 40 um standard or 5 um (code W) where finer particulate removal is needed - this unit carries the 5 um element. Gauge options are the embedded square gauge or an external round gauge, with MPa, psi or bar scales; this unit has a round MPa gauge. Thread is PT as standard with G and NPT as orderable options, and a bracket can be added where panel or wall fixing is required. Flow for these units is published as curves, not a single rating, so send us your application details 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. 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 flow number for this unit. Send us your application details - required pressure and estimated air consumption - and we will confirm the sizing against the datasheet on request before you order.
The code GFR30008ALJC1WT decodes A as the automatic drain, which expels collected condensate from the bowl without manual attention, and W as the 5 um filter element, the finer of the two published grades (40 um is standard). If your circuit can tolerate 40 um or needs a different drain routine, those are orderable options in the same series.
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.