The AirTAC GFR300-10 AirTAC Filter Regulator PT3/8, 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 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: water and particulate removal plus downstream pressure regulation in a single body. This 300-size unit carries a 3/8 in PT port, a 5 um filter element for finer air than the 40 um standard, and an automatic drain that expels collected condensate without manual attention. It is the low-pressure (L) type, so it is set up for reduced-pressure circuits rather than full-line regulation, and it comes with an external round gauge reading in psi. No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, filter grades of 40 um standard or 5 um optional, and a choice of drain type, gauge style and scale. Flow is published as curves rather than a single rating, so ask us to confirm the figures for your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator PT3/8, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT 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. |
| (blank) | PT 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) |
Feeds clamp and hold-down cylinders on a fixture press, filtering condensed water and fine particles from the shop air while holding the reduced working pressure the cylinders were sized for.
Conditions the air feeding a paint or coating line: the 5 um element catches fine particulate that would mar a finish, and the low-pressure regulation suits atomising and gun circuits that run well below header pressure.
Supplies filtered, regulated pilot air to solenoid and pneumatic actuator banks on a process skid, with the automatic drain keeping condensate out of the pilot circuit between maintenance rounds.
Start with the port step: this unit is 3/8 in PT, so match it to your line size and the flow your circuit needs - larger sizes (400, 600) carry more flow, smaller sizes (200) less. Choose the drain to suit access: automatic (this unit) suits enclosed or infrequently visited installations, manual suits attended stations, and differential-pressure drain is the catalogue default. The 5 um element (W) is the finer choice over the 40 um standard where downstream valves or instruments need cleaner air. Gauge scale options are MPa, psi (this unit, round external gauge) or bar; the embedded square gauge is the standard alternative. Thread is PT as standard, with G (BSPP) and NPT available to order as specifications. Note the low-pressure (L) type designation: its regulation range differs from the standard type and the exact figure is not published, so confirm it with us. Flow is published as curves, not a single rating - ask us to confirm sizing against your application before ordering.
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 this series as performance curves rather than a single rated figure, so we do not quote a number here. Tell us your line pressure and the flow your application needs and we will confirm the sizing from the datasheet on request.
The L in the code marks the low-pressure regulator type, intended for reduced-pressure circuits rather than standard full-range regulation. Its exact adjustment range is not published in the material we hold, so please confirm the range with us before ordering if your set pressure is critical.
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.