The AirTAC GFR300-10 AirTAC Filter Regulator NPT3/8 Low-Pressure 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This 300-size unit is built around a 3/8 in NPT port and carries an automatic drain that expels collected condensate without anyone having to open it, a 5 um filter element (code W, finer than the 40 um standard) in a polycarbonate bowl, an external round gauge reading in psi, and the low-pressure regulator type for circuits that do not run at standard regulation settings. The exact adjustment range for the low-pressure type is not published; we confirm it on request.
This is a genuine AirTAC part from the GFR300 series, one of four sizes (200, 300, 400, 600) in the GFR range with ports from 1/8 in to 1 in. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature is -5 to 70 C, non-freezing. Flow for this series is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| 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 — round, psi 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). |
| C | Gauge shape: Round. 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. |
| (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) |
Feeding filtered, regulated air to the cylinders that drive carton forming and sealing heads on a packaging line, with the 5 um element protecting the machine's directional valves from particulate carryover.
Supplying regulated air to pneumatic clamps on a machining-cell fixture where the circuit is set below standard line regulation, using the low-pressure regulator type to hold the clamp pressure where the fixture needs it.
Conditioning air for gripper cylinders and actuated stops along a conveyor line, with the automatic drain keeping condensate out of the actuators at a station that is not checked every shift.
The real choices in this family are size and port (200/300/400/600, 1/8 in to 1 in), drain type (differential-pressure, automatic or manual), filter grade (40 um standard or 5 um with code W), gauge (embedded square standard, external round optional, in MPa, psi or bar scales), thread (PT standard, G and NPT as order options) and bracket. This GFR300-10 pairs the 300 size with a 3/8 in NPT port, automatic drain, 5 um element, round psi gauge and low-pressure regulation, supplied without a mounting bracket. Flow is published as curves, not a single rated figure, so 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. 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 GFR300 series as curves rather than a single rated figure, so we do not quote a number here. Send us your required flow and working pressure and we will confirm against the datasheet whether the 300 size with its 3/8 in port suits your application.
The W code fits a 5 um element instead of the 40 um standard, giving finer particulate removal for sensitive downstream components such as precision valves and cylinders. The automatic drain expels collected condensate on its own, which suits installation points that are not checked daily. Both are factory-decodable options on this model.
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.