The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 5 um PSI Gauge 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 differential-pressure 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 sets downstream pressure in a single 300-size body with a 1/4 in NPT port. This configuration carries the 5 um filter element (code W) for finer particle capture than the standard 40 um grade, a differential-pressure auto drain that bleeds collected condensate without manual attention, an embedded square gauge reading in psi, and a built-in reverse/check valve that holds downstream pressure when the upstream supply is lost. It ships without a mounting bracket. The polycarbonate bowl is rated to 1.0 MPa (145 psi) maximum inlet, regulation covers 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, gauge scales in MPa, psi or bar, and PT, G or NPT threads. We confirm flow figures and the full datasheet on request - flow for this series is published as curves rather than a single rated number.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5 um PSI Gauge |
|---|---|
| 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 | 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, 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". |
| (blank) | Drain: Differential-pressure 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 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) |
Feeds clean, pressure-set air to tool-clamp and actuation circuits on a CNC machining centre, with the 5 um element guarding fine pilot valves and the check valve holding clamp pressure if the shop supply dips.
Conditions the air feeding cylinder-driven diverters, pushers and sealing jaws on a packaging conveyor line, keeping moisture and particles out of the valves while the regulator holds a stable jaw pressure.
Prepares the air supply to spray and coating equipment in a finishing booth, where the 5 um grade protects atomising hardware and the differential-pressure drain clears condensate without interrupting the shift.
Size the GFR series by port step against the air demand of the circuit: 200, 300, 400 and 600 correspond to increasing port sizes and flow capacity, so pick the smallest size whose flow curve covers your consumption with margin. Because flow is published as curves and not a single rating, ask us to confirm sizing against your application before ordering. Then choose the drain: differential-pressure (default, this model), fully automatic, or manual; the filter grade, 40 um standard or 5 um (W) as fitted here; the gauge scale, MPa, psi or bar; and the thread, PT as standard or G/NPT to order. Brackets are optional on GFR, and a low-pressure regulator type (L) is available where set pressures stay below 0.4 MPa. A check valve (K), as on this unit, is worth specifying whenever held downstream pressure matters between cycles.
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 characteristic curves rather than a single rated figure, so we do not quote a l/min, m3/h or SCFM number. Tell us your operating pressure and air consumption and we will confirm the flow curve and correct sizing from the datasheet on request before you order.
The W in the code GFR30008JF2WTK selects the optional 5 um filter grade in place of the standard 40 um element, for finer particle removal ahead of sensitive downstream components. The K code fits a reverse/check valve that holds downstream pressure when the upstream supply is interrupted. If you would rather have the 40 um grade, no check valve, a different gauge scale, or a PT or G thread version of the same 300-size unit, those are standard catalogue options - just ask.
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.