The AirTAC GFR300-15T AirTAC Filter Regulator NPT1/2 Low-Pressure 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 PT1/2" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300-15T is a size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is built with a 1/2 in NPT port, a manual drain bowl in polycarbonate, a fine 5 um filter element, and a low-pressure regulator type. A reverse/check valve is fitted, and the unit ships without a pressure gauge and without a mounting bracket.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of drain types, 40 um or 5 um filtration, gauge options and PT, G or NPT threads. Flow figures for this series are published as curves rather than a single rating, so ask us to confirm sizing data from the datasheet for your application.
| Model | GFR300-15T AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Not fitted |
| 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. |
|---|---|
| 15 | Port size PT1/2". This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure type. Blank is standard, L is the low-pressure type. |
| J | Supplied without bracket. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| T | NPT 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Feeds filtered, regulated air to clamping cylinders and fixture actuators on a CNC machining centre, with the 5 um element protecting pilot valves from particulate and the check valve holding the set circuit.
Supplies cleaned, regulated air at low set pressures to pick-and-place and forming heads on a packaging line, where the manual drain bowl is emptied during scheduled changeovers.
Sits at the drop point of an assembly bench, filtering and regulating supply air for air tools and small actuators, with the 1/2 in NPT port matching the main drop plumbing.
Choose the GFR300 size step when your line sits in the 1/2 in port class; step up to size 400 or 600 for larger air demand, or down to 200 for compact circuits. Drain type is a real decision: manual drain means an operator drains the bowl on a routine, while automatic and differential-pressure drains discharge condensate continuously. The 5 um element (code W) suits air that feeds sensitive valves and instruments; the 40 um standard element covers general circuit protection. Gauge and scale choice, PT versus G or NPT thread, and bracket inclusion are all selectable in this series.
Because flow for the GFR series is published as curves and not as a single rated figure, ask us to confirm sizing against your application before ordering. For this low-pressure type, we will also confirm the regulation range from the datasheet 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 figure, so we do not quote one number. Tell us your application and we will confirm the relevant flow and sizing data from the datasheet on request, along with the regulation range for this low-pressure type.
The code M sets a manual drain: an operator opens the bowl drain on a routine to remove collected condensate, instead of the automatic or differential-pressure drain options available in the series. The code N means no pressure gauge is fitted; gauge options with MPa, psi or bar scales can be selected on other configurations in this series.
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.