The AirTAC GFR300-15 AirTAC Filter Regulator NPT 1/2 in Low-Pressure 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 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 GFR300-15 is a filter regulator: a 40 um filter and a pressure regulator combined in a single body, so one station removes water and particulate from compressed air and holds a set downstream pressure. This unit is built on the 300 size with a 1/2 in NPT port, a manual-drain bowl in polycarbonate, and the low-pressure (L) regulator type. A round gauge with a psi scale is fitted, a reverse (check) valve is included, and no mounting bracket is supplied with this code.
It is a genuine AirTAC part. The GFR family spans 200, 300, 400 and 600 sizes with ports from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, a 5 um (W) filter option, gauge scale choices, and PT, G or NPT threads. 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 rating, so ask us to confirm sizing and any datasheet figure for your application.
| Model | GFR300-15 AirTAC Filter Regulator NPT 1/2 in Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 40 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 | 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. |
|---|---|
| 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. |
| (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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
On a machining fixture or pneumatic press that runs its clamps at reduced pressure, this low-pressure filter regulator cleans the supply and holds the set clamp pressure from one 1/2 in station, with the psi gauge giving a direct read of the setting.
At the air drop feeding a packaging machine's cylinders and directional valves, this 1/2 in filter regulator removes water and 40 um particulate and holds a set supply pressure, with the round psi gauge letting operators read the setting at a glance.
On a laboratory or QA test bench where instruments and actuators need clean, regulated air, the low-pressure type and psi-scaled gauge make this unit a single-station supply point, with the manual drain cleared between sessions.
Size the unit by port and flow: the GFR family steps through 200, 300, 400 and 600 sizes with ports from 1/8 in to 1 in, and this 300-size unit carries a 1/2 in NPT port (PT is the standard thread; G and NPT are order options). Drain type is a real choice: this code has a manual drain, while automatic and differential-pressure drains are available in the same series. Filter grade is the 40 um standard element; specify W for 5 um. The gauge here is a round external gauge with a psi scale; embedded square gauges and MPa/psi/bar scales are the alternatives. This is the low-pressure regulator type and carries a reverse (check) valve; no bracket is included, and brackets are optional. Because flow is published as curves rather than a single rating, send us your application details and we will confirm sizing 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 GFR flow as performance curves, not as a single rated figure, so we do not quote a number here. Tell us your application - inlet pressure, downstream demand and acceptable pressure drop - and we will confirm the flow and the full datasheet for this model on request.
The M in the code sets a manual drain: accumulated condensate in the PC bowl is drained by hand, so the bowl should be checked as part of routine maintenance. If you prefer unattended draining, the same GFR300 series is available with automatic or differential-pressure drains - ask us for those codes.
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.