The AirTAC GFR300-10 AirTAC Filter Regulator PT3/8 Auto Drain 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 300-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is fitted with a PT3/8 port, an automatic drain that expels collected condensate without manual attention, a 40 um standard filter element, a round pressure gauge reading in psi, a reverse/check valve that holds the set pressure when the upstream supply is lost, and a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the standard regulator adjusts from 0.15-0.9 MPa (20-130 psi). Operating temperature is -5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port options from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drain, a 5 um (W) element option, gauge scale choices, and G or NPT thread variants. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300-10 AirTAC Filter Regulator PT3/8 Auto Drain |
|---|---|
| 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 | Standard 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 | 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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)). |
| (blank) | Standard 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. |
| (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) |
Feeding a workshop air press: the 40 um element strips water and pipe scale before they reach the cylinder seals, the regulator holds a steady working pressure for consistent forming, and the check valve keeps the set pressure intact during compressor unload cycles.
On a packaging line driving conveyor stoppers and carton clamps, the automatic drain clears condensate on a line that runs unattended through shifts, while the psi gauge lets operators verify set pressure at a glance.
Supplying a laboratory automation rig or test bench where instruments need clean, regulated air: the filter-regulator conditions the feed in one body, and the check valve prevents backflow disturbances from upsetting the setpoint.
Size and port: the 300 size steps up from the 200 series with a 3/8 in PT port, so choose it when your line's flow demand outgrows a 1/4 in unit; larger 400 and 600 sizes exist for bigger draws. Drain: automatic drain suits unattended or hard-to-reach installations; manual and differential-pressure drains remain available if you prefer operator-controlled or demand-based purging. Filter grade: 40 um is standard for general protection; specify the 5 um (W) element when downstream valves or instruments need finer filtration. Gauge: this unit carries a round psi gauge; embedded square gauges and MPa or bar scales are alternatives. Thread: PT is standard, with G (BSPP) and NPT orderable. A bracket is included, and the K option adds the reverse/check valve fitted here.
Because catalogue flow is given as curves and not a single rated figure, send us your application's air demand 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. 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 figure that could mislead your sizing. Tell us your application's air demand and port size and we will confirm the relevant flow-curve and datasheet figures on request before you order.
This GFR300-10 carries code A, an automatic drain that discharges collected condensate from the polycarbonate bowl without operator input - useful for unattended or hard-to-reach installations. If you prefer a manual (M) or differential-pressure drain, those variants exist in the same 300 size; note that the regulator range differs by drain type: automatic and differential-pressure units adjust 0.15-0.9 MPa (20-130 psi), while manual-drain units adjust 0.05-0.9 MPa (7-130 psi).
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.