The AirTAC GFR300-10 NPT AirTAC Filter Regulator, 3/8 in, 5 um 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 PT3/8" 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 GFR300-10 is a 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is ordered with NPT3/8 (3/8 in) ports, a 5 um filter element (code W) for finer filtration than the standard 40 um grade, an automatic drain that expels collected condensate without manual attention, and the low-pressure regulator type. It carries the embedded square gauge with a bar scale, and no mounting bracket is fitted; a reverse/check valve is not included.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures on request before you order.
| Model | GFR300-10 NPT AirTAC Filter Regulator, 3/8 in, 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (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 — square, bar 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. |
|---|---|
| 10 | Port size PT3/8". 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). |
| F | Gauge shape: Square. 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. |
| (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 · PT3/8" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
Filtered, regulated air feeding clamps and fixtures on a machining centre, where the 5 um element helps keep chips-laden condensate and fine particles out of the clamp cylinders and the low-pressure setting matches the fixture circuit.
A supply point on a packaging line feeding carton-sealing and case-packer cylinders, with the automatic drain clearing condensate at an unattended station and the square bar gauge letting line staff read the set pressure at a glance.
Regulated, filtered air to lab benches and test rigs that run below standard line pressure, where the low-pressure regulator type, fine 5 um filtration and bar-scale gauge suit sensitive instruments and benchtop apparatus.
Start with the port step: the 300 size with 3/8 in NPT ports suits lines whose pipe and fittings are 3/8 in; step up to 400 or 600 where the circuit needs more capacity, and match the thread to your installation by ordering PT or G instead of NPT if required. For the drain, automatic suits points that are hard to reach or run long shifts; manual suits attended stations; the differential-pressure default is the catalogue standard. Filtration is 5 um here (code W) against the 40 um standard element - choose 5 um where downstream valves and instruments are sensitive. The square gauge is fitted with a bar scale; MPa and psi scales and an external round gauge are the other catalogue options. A bracket can be added by ordering the non-J code.
Sizing against your application is the one step we ask you not to guess: flow for this series is published as curves, not a single rated figure, so send us your demand and we will confirm the correct size from 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 rather than a single rated figure, so there is no one number we can honestly quote. Send us your application demand and we will confirm the sizing from the datasheet on request before you order.
The A in this code orders the automatic drain, which expels collected condensate without anyone opening the bowl - useful at unattended or hard-to-reach points. The same GFR300 series is also available with a manual drain or the differential-pressure default, so you can match the drain to how the station is operated.
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.