The AirTAC GFR300-10 G3/8 AirTAC Filter Regulator, 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 GFR300-10 is an AirTAC GFR-series filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 300-size unit carries a G3/8 (BSPP) port, a 5 um filter element (the finer W grade, versus the standard 40 um), an automatic drain that ejects collected condensate without manual attention, and the low-pressure (L) regulator type for applications set well below standard line pressure. A round external gauge scaled in psi is fitted for set-point reading, and the mounting bracket is included. The polycarbonate bowl suits this size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part. GFR filter regulators span the 200, 300, 400 and 600 sizes with port options from 1/8 to 1 inch, drain types (differential-pressure, automatic, manual), 40 um or 5 um elements, standard or low-pressure regulation, gauge choices, and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm sizing figures from the datasheet for your application.
| Model | GFR300-10 G3/8 AirTAC Filter Regulator, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (G (BSPP) 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. |
| (blank) | Mounting bracket included. |
| (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. |
| G | G (BSPP) 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 the clamp cylinders on a CNC fixture circuit: the 5 um element keeps spool valves clean while the low-pressure regulator holds a gentle, repeatable clamp force and the psi gauge lets the setter verify the set point.
Sits ahead of the spray guns in a finishing booth, filtering water and particles that would ruin a finish and regulating a low, stable atomising pressure read directly off the round psi gauge.
Conditions and regulates the air feeding the fold-and-tape cylinders of a case sealer, with the automatic drain handling condensate on a unit mounted where nobody opens a bowl during a shift.
Start with the port: this unit is 3/8 inch on the 300 size; step up to 400 or 600 when the machine's air demand outgrows the line, or down to 200 for compact circuits. Choose the drain to match access: automatic (as fitted here) where the unit is hard to reach, manual where an operator checks routinely, or the differential-pressure default. Pick 5 um (this unit) when downstream valves, cylinders or instruments need finer air than the standard 40 um element delivers. Gauge scale is selectable (MPa, psi or bar); this configuration carries a round psi gauge. Thread is PT by default, with G (BSPP, as here) or NPT as order options; a bracket is included, and the low-pressure (L) regulator type suits circuits set below standard pressures. Because flow is published as curves, not a single rated figure, send us your application details and we will confirm sizing 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, not as a single rated number, so we do not quote a l/min, m3/h or SCFM figure here. Tell us your line pressure and the air demand of your equipment and we will confirm the correct size from the datasheet on request.
This configuration carries code A, the automatic drain, which ejects collected condensate by itself. It is the right choice where the unit is mounted in an awkward spot or runs unattended; manual and differential-pressure drains are available on other GFR300 variants if you prefer operator-controlled draining.
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.