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 filter regulator: it removes water and particulate from compressed air and holds downstream pressure in a single body. This configuration is built on the 300 size with a PT3/8 port, an automatic drain that bleeds collected condensate from the polycarbonate bowl without manual attention, the 40 um standard filter element, and the low-pressure regulator type. A round psi gauge is fitted and a reverse/check valve is included.
This is a genuine AirTAC part from the GFR series, which spans the 200, 300, 400 and 600 sizes with ports from 1/8 to 1 inch, plus drain, filter-grade, gauge, thread and mounting options. 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 rated figure, so we confirm datasheet values on request.
| 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 | 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 | 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. |
| 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. |
| (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) |
Conditioning and reducing supply air to a pneumatic clamping fixture on an assembly line, where the low-pressure regulator type and filtered air keep the clamps holding consistently through the shift.
A point-of-use filter regulator ahead of the cylinders and diverters on a packaging conveyor, with the automatic drain handling condensate so the bowl does not need daily attention.
Cleaning and stepping down shop air at a compressed-air drop feeding bench instruments in a laboratory, with the psi gauge giving a local reading of the set pressure.
Size and port step up from 200 through 600 as required flow grows; this unit sits at 300 with a 3/8 inch PT port. Drain type is a real choice in the series - automatic here, with manual and differential-pressure drains available - and filter grade is the 40 um standard, with 5 um (code W) for finer filtration. The round psi gauge is fitted; an embedded square gauge with MPa, psi or bar scale is the standard alternative. Thread is PT as standard, with G (BSPP) and NPT as catalogue options to order, and the J code means no mounting bracket. 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
Flow for the GFR series is published as curves rather than a single rated figure, so we do not quote one number. Send us your application's flow and pressure requirements and we will confirm sizing from the AirTAC datasheet on request.
L marks the low-pressure regulator type, suited to circuits set below the standard range; the exact adjustment range for this type is not published in the catalogue, so we confirm it on request. A is the automatic drain, C2 is the fitted round gauge with a psi scale, and K means a reverse/check valve is included.
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.