The AirTAC GFR300-15T AirTAC Filter Regulator NPT1/2 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 PT1/2" 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 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady, in a single body. This configuration carries a 1/2 in NPT port, a 5 um filter element, an automatic drain that ejects collected condensate without anyone opening a valve, an embedded square gauge reading in bar, and a reverse (check) valve that helps hold downstream pressure if the supply dips. Regulation range is 0.15-0.9 MPa (20-130 psi) with a maximum inlet pressure of 1.0 MPa (145 psi), the polycarbonate bowl suits non-freezing compressed air from -5 to 70 C, and no mounting bracket is fitted.
This is a genuine AirTAC part in the GFR series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in and PT, G (BSPP) or NPT threads. Drain type, filter grade, gauge scale, bracket and thread are all orderable choices. Rated flow is published as curves rather than a single figure, so ask us and we will confirm the datasheet numbers for your application on request.
| Model | GFR300-15T AirTAC Filter Regulator NPT1/2 5 um Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 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 — square, bar 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 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) |
On a machining cell, the GFR300-15T cleans shop air down to 5 um and holds a steady clamp pressure, so pneumatic fixtures grip workpieces consistently through the whole production run.
Pilot-operated process valves on a bottling line behave repeatably when fed filtered, regulated air; the automatic drain keeps condensate out of the valve pilots without manual attention.
Cylinders that divert cartons on a packaging conveyor run more smoothly and last longer when supplied with clean, pressure-stabilised air from a filter regulator at the line drop.
Size the unit by the flow your line needs: the 200, 300, 400 and 600 frames step up in port and capacity, and this 300 sits at 1/2 in NPT. Drain options are differential-pressure (default), automatic (this unit) and manual; automatic suits installations where nobody regularly visits the drain point. Filter grade is 40 um standard or 5 um (this unit, code W) for finer protection of valves, cylinders and instruments. The embedded square gauge on this model reads in bar, with MPa, psi or bar scales available, and an external round gauge is an option. Thread is PT as standard, with G and NPT as orderable options; a bracket is optional and not fitted here. Because rated flow is published as curves rather than one number, send us your 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 figure, so we do not quote a number here. Tell us your working pressure and air demand and we will confirm the datasheet flow curve for this 1/2 in NPT unit on request, before you order.
The W code fits a 5 um element instead of the 40 um standard, giving finer protection for valves, cylinders and instruments downstream. The A code adds an automatic drain, so collected water is ejected without manual draining - useful where the unit sits in a spot nobody visits regularly. Both are catalogue build options for this 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.