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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single 300-size body with a 1/4 in NPT port. This configuration carries the fine 5 um filter element (code W), an automatic drain that bleeds collected condensate from the PC bowl without manual attention, a low-pressure regulator type for circuits running well below standard line pressure, a round pressure gauge reading in bar, and a reverse/check valve fitted. A mounting bracket is included.
This is a genuine AirTAC part from the G-series range, which spans sizes 200 to 600 with port sizes from 1/8 in to 1 in and thread options in PT, G (BSPP) and NPT. Flow figures for the GFR series are published as curves rather than a single rated number, so ask us and we will confirm the datasheet figures for your application on request.
| 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, 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. 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. |
| (blank) | Mounting bracket included. |
| (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. |
| 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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Air-prep point for clamp cylinders on a CNC machining cell: the 5 um element protects the clamp valve and cylinder seals from particulate and water while the low-pressure regulator holds the clamp circuit at its working setting.
Conditioning the air feeding diverters, pushers and gate cylinders on a packaging conveyor, where the automatic drain keeps condensate out of the circuit during continuous shifts without an operator bleeding the bowl.
Clean, regulated air for laboratory automation and small test-rig actuators that run at reduced pressure, with the fine 5 um grade and bar-reading gauge suiting instruments and low-pressure circuits.
Size and port step up together: 200 through 600 cover 1/8 in to 1 in, so pick the size whose flow curve covers your demand rather than oversizing on guesswork. This unit is already set with the 5 um fine element; the standard element is 40 um if your circuit does not need fine filtration. Drain choice is differential-pressure (default), automatic (as here) or manual - automatic suits unmanned or hard-to-reach installations. The gauge here is the external round type reading in bar; an embedded square gauge with MPa, psi or bar scales is the alternative. Thread is NPT on this code, with PT as the standard and G (BSPP) orderable; a mounting bracket is included.
Because flow for the GFR series is published as curves rather than a single rating, send us your application details and we will confirm the 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 GFR series as curves rather than a single rated figure, so no rated flow number is stated here. Send us your line pressure and air demand and we will confirm the datasheet flow curve and sizing for your application on request.
The A in the code GFR30008ALC3WTK selects the automatic drain, which ejects collected condensate from the PC bowl by itself - useful where the unit is mounted in a hard-to-reach spot. The W selects the fine 5 um filter element instead of the 40 um standard grade, for circuits with sensitive valves or actuators downstream.
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.