The AirTAC GFR300-15 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 GFR300-15 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 300-size unit is configured with a 1/2 in NPT port, a 5 um filter element (the finer of the two published grades, versus the 40 um standard), an automatic drain that expels collected condensate without manual attention, and a reverse/check valve fitted. Outlet pressure is set across the standard 0.15-0.9 MPa (20-130 psi) adjustment range and read on the external round gauge supplied with a psi scale. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits this size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part. The GFR filter-regulator line spans 200, 300, 400 and 600 sizes with port sizes from 1/8 in to 1 in, and options for manual or differential-pressure drains, 40 um or 5 um elements, square or round gauges with MPa, psi or bar scales, a low-pressure regulator type, G/NPT threads and bracket choices. Because flow is published as curves rather than a single rated figure, we confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-15 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 — 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. |
|---|---|
| 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 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) |
Point-of-use conditioning ahead of a machining centre's pneumatic valve stack: the 5 um element protects spools and orifices from particulate and water, while the regulator holds a steady set pressure for clamping and tool-change cylinders.
Feeding air cylinders and grippers on a packaging or cartoning conveyor, where the automatic drain keeps condensate out of the circuit during continuous runs and the psi gauge lets operators verify set pressure at a glance.
Conditioning air at a spray-booth or finishing station, where the 5 um grade and regulated outlet support consistent atomiser supply pressure and the check valve helps hold the downstream circuit if upstream pressure dips.
Step up or down through the 200/300/400/600 sizes and their port options (1/8 in to 1 in) to match the flow your line needs - the catalogue publishes flow as curves, so ask us to check the curve against your demand before ordering. On this family the real choices are: drain type (automatic, as fitted here, versus manual or differential-pressure), filter grade (40 um standard versus the 5 um W element on this unit), gauge style and scale (embedded square or external round; MPa, psi or bar), thread (PT is the standard; G and NPT are order options), and bracket (this code omits the bracket). Regulation range also depends on drain: 0.15-0.9 MPa with automatic or differential-pressure drains, 0.05-0.9 MPa with manual drain. Route sizing through us: we confirm flow and datasheet figures on request so you order the right size the first time.
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, not as a single rated number, so we do not quote a figure here. Send us your required flow and working pressure and we will confirm against the datasheet curve whether the 300 size at 1/2 in NPT is the right choice before you order.
The A in the code selects the automatic drain, which expels collected condensate without anyone opening the bowl - useful on unattended or continuously running equipment. The W selects the 5 um element, the finer of the two published grades (40 um is standard), for points of use that need cleaner air. The C2 adds an external round gauge with a psi scale, and K fits a reverse/check valve.
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.