The AirTAC GFR300-15 AirTAC Filter Regulator 1/2 in 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 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 size-300 filter regulator that cleans compressed air and holds downstream pressure in a single body. This configuration is the low-pressure type, so it suits circuits that run at reduced working pressure rather than full line pressure. It carries a 5 um filter element (the finer of the two catalogue grades), an automatic drain that expels collected condensate without manual attention, an embedded square gauge reading in psi, and a reverse/check valve fitted. The port is PT1/2 (1/2 in PT thread), the maximum inlet pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C, non-freezing. The PC (polycarbonate) bowl is transparent for a quick fluid and element check.
This is a genuine AirTAC part. The GFR series is published in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um (W) elements, standard or low-pressure regulation, square or optional external round gauges with MPa, psi or bar scales, G or NPT thread options, and bracket choices. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures on request.
| Model | GFR300-15 AirTAC Filter Regulator 1/2 in Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (PT thread) |
| Filtering grade | 5 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 — square, 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". |
| 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). |
| F | Gauge shape: Square. 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. |
| (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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Cleaning and regulating the air feeding sealing and clamp actuators on a packaging machine that runs its pneumatic circuit at reduced working pressure, with the 5 um element protecting the valves downstream.
Conditioning the supply to a bench assembly station where screwdrivers and air cylinders share one 1/2 in line, and the automatic drain keeps condensate out of the tools without daily bowl checks.
Filtering and regulating the air to conveyor stopper and divert cylinders, with the check valve holding the set pressure if the upstream supply dips and the psi gauge giving operators a visible setpoint.
Start with the size and port: the 300 size with a 1/2 in PT port sits in the middle of the GFR range, and the right step up or down depends on the air demand of the circuit - we confirm the flow curve against your application before you order. This unit is the low-pressure type, intended for circuits regulated below standard working pressure; ask us for the exact adjustment range, which is not published as a single figure. The 5 um element is the finer choice where downstream valves and cylinders need cleaner air than the 40 um standard grade provides. The automatic drain suits unattended or hard-to-reach installations; manual and differential-pressure drains are available elsewhere in the series. The square psi gauge is embedded as standard, with an external round gauge and MPa or bar scales as options. PT is the standard thread; G (BSPP) and NPT are order options. This code carries no mounting bracket (J); brackets are available on other configurations.
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 curves rather than a single rated figure, so we do not quote a rated flow number. Send us your inlet pressure and air demand and we will confirm the sizing from the datasheet on request before you order.
The L code means this GFR300-15 is the low-pressure regulator version, intended for circuits that run below standard working pressure; its exact adjustment range is not published, so we confirm it on request. The A code is the automatic drain, which ejects collected condensate by itself instead of waiting for a manual bowl drain.
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.