The AirTAC GFR300-15LJF3TK AirTAC Filter Regulator NPT1/2 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 differential-pressure 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 GFR300-15LJF3TK is a size 300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration carries a 1/2 in NPT port, the standard 40 um filter element, a differential-pressure drain that bleeds collected condensate automatically as flow passes through, an embedded square pressure gauge scaled in bar, and a built-in reverse (check) valve that holds the downstream setting when upstream supply is lost. It is the low-pressure type, intended for circuits set well below standard regulator ranges, and is supplied without a mounting bracket. The polycarbonate bowl lets you see the condensate level at a glance.
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 and PT, G and NPT thread options. Drain types, filter grades, gauge scales and bracket choices can be selected per code. Flow figures for this series are published as curves rather than a single rating, so ask us and we will confirm the datasheet numbers for your application on request.
| Model | GFR300-15LJF3TK AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 40 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 | Differential-pressure 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. 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". |
| (blank) | Drain: Differential-pressure 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. |
| 3 | Gauge scale: bar. 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) |
Feeds the clamp cylinders on a CNC fixture with filtered air and holds a gentle, low set pressure so workpieces are secured without crushing, while the check valve keeps the clamp from relaxing during a supply dip.
Mounted ahead of the directional valves on a carton sealing or wrapping machine, it strips water and pipe scale from the shop air supply and gives operators a bar-scaled set point they can verify at the panel.
Conditions the air feeding gripper actuators on a robotic handling cell, where the low-pressure type regulator protects delicate parts and the 40 um element keeps small valve orifices from fouling.
Step up or down the size ladder (200, 300, 400, 600) to match the port and flow path your line needs; size 300 with the 15 code gives a 1/2 in port here, in NPT thread, with PT and G available as order options. Choose the drain to suit maintenance access: differential-pressure (this unit, drains itself with flow), automatic, or manual where you want controlled purging. The 40 um element is the standard grade; specify W for the 5 um grade if downstream equipment needs finer filtration. The embedded square gauge is fitted here with a bar scale; MPa, psi and round external gauges are alternatives. This is the low-pressure type, so if your set point is modest, confirm the exact range with us before ordering. Flow for this series is published as curves, not a single rating, so have us confirm sizing against your application 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 one number. Tell us your application and we will confirm the relevant flow and datasheet figures for this model on request.
The differential-pressure drain (the blank drain code) purges collected condensate automatically as air flows through, so no manual blowing down is needed in normal operation. The L in the code marks the low-pressure regulator type, intended for circuits set below standard ranges; the exact adjustment range for this variant is not published in our sheet, so confirm it with us before ordering.
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.