The AirTAC GFR300-10 AirTAC Filter Regulator PT3/8 Low-Pressure is a genuine G-series filter regulator: water separation, 40 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 a single body. This 300-size unit is specified with a PT3/8 (3/8 in) port, an automatic drain that ejects collected condensate without manual attention, a 40 um standard filter element, and the low-pressure regulator type. The square pressure gauge is fitted with a psi scale, a reverse/check valve is fitted to hold downstream pressure, a mounting bracket is included, and the polycarbonate bowl suits non-freezing compressed-air service from -5 to 70 C with a maximum inlet pressure of 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, and options including manual or automatic drains, a 5 um element (code W), gauge scale in MPa, psi or bar, and G or NPT thread versions to order. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR300-10 AirTAC Filter Regulator PT3/8 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT3/8" (PT thread) |
| Filtering grade | 40 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, 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. 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-10 (two-unit set) |
On a CNC machining cell where fixtures and clamps run at reduced line pressure, this filter regulator cleans the shop air of water and swarf-carrying particulate and holds the clamp circuit at the set pressure, with the check valve holding the circuit if supply dips.
Feeding cylinders and air jets on a carton sealing or wrapping line, the 40 um element protects directional valves from dirt and the automatic drain keeps condensate out of the supply on a line that runs unattended across shifts.
On a bottling or filling machine where actuators and blow-off nozzles are specified for pressures well below the main header, the low-pressure regulator type sets a gentle, stable supply downstream of the filter stage, with the psi gauge giving operators a local readout.
Choose the size and port step against the air demand of the circuit: the GFR300-10 sits in the 300 frame with a PT3/8 (3/8 in) port, one step above the 1/4 in class and one below the 1/2 in class. Drain type is a real decision: this unit has the automatic drain (code A), which suits unattended or hard-to-reach installations; manual and differential-pressure drains are available elsewhere in the family. The 40 um element fitted here is the standard grade; specify code W for the 5 um grade where finer filtration is needed. The fitted square gauge reads in psi; MPa and bar scales are options, and an external round gauge is also available. Thread is PT as standard, with G (BSPP) and NPT versions orderable, and the mounting bracket is included.
One honest note on sizing: flow for this series is published as curves, not as a single rated number, so send us your application details and we will confirm the right size against the datasheet before you order. The exact regulation range of the low-pressure type is likewise confirmed on request.
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 curves rather than a single rated number, so we do not quote a rated flow, Cv or l/min figure. Send us your application details and we will confirm the datasheet and check the sizing of the GFR300-10 against your air demand before you order.
The A in the code GFR30010ALF2K specifies the automatic drain, which ejects collected condensate by itself - useful where the unit is mounted in a hard-to-reach spot or the installation runs unattended. If you prefer to control drainage manually, GFR variants with a manual drain (code M) or the differential-pressure drain (blank) are available in the same family.
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.