The AirTAC GFR300-15LJF2WT AirTAC Filter Regulator NPT1/2 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 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 GFR300-15LJF2WT is a GFR-series filter regulator: water and particulate filtration plus pressure regulation combined in a single 300-size body with a 1/2 in NPT port. This configuration carries the W code, so it filters to 5 um rather than the standard 40 um, and the L code, so it is the low-pressure regulation type. The bowl drains by differential pressure, so collected condensate is expelled automatically whenever the pressure differential across the element is high enough - no daily manual draining on lightly loaded lines. A square pressure gauge is fitted and reads in psi, and the J code means the mounting bracket is not included.
This is a genuine AirTAC part from the GFR300 range, which spans the 200/300/400/600 sizes with port options from 1/8 in to 1 in and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). The 300-size bowl is PC (polycarbonate). Flow is published by AirTAC as curves rather than a single rated figure, so ask us to confirm flow and datasheet figures for your application before ordering.
| Model | GFR300-15LJF2WT AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| 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 | 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, psi scale |
| Reflux valve | Not fitted |
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. |
| 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. |
| (blank) | No reverse-flow valve (the default). |
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) |
A low-pressure filter regulator sits ahead of the clamping fixtures on a CNC cell, cleaning the air to 5 um and holding a gentle, steady clamp pressure so finished surfaces are not marked.
On a bagging or wrapping line, the unit feeds the sealing and tucking cylinders: the 5 um grade protects the small control valves, the low-pressure type suits the soft setpoints the seal arms need, and the psi gauge lets an operator read the setting at a glance.
In a panel feeding low-pressure air cylinders or air bearings downstream, the 1/2 in NPT connection carries the branch flow, the differential-pressure drain keeps condensate out of the manifold, and regulation is trimmed to the low pressure the actuators were designed for.
Choose the 300 size with the 1/2 in port when your line runs at mid-to-high air consumption; smaller 200/400 sizes step the port and body up or down, and the right size depends on the flow your circuit needs. This unit is the low-pressure (L) type - select it where the downstream setpoint sits well below the standard range; the exact regulation window for the low-pressure type is not published in the sheet we transcribe, so confirm it with us. The 5 um element (W code) suits valves and cylinders that want finer air than the 40 um standard; the differential-pressure drain suits runs that see enough flow to self-purge. The fitted square gauge reads in psi; MPa or bar scales and an external round gauge are order options. Thread here is NPT; PT and G (BSPP) are the other catalogue options. A mounting bracket can be ordered if you want the unit secured off the piping.
One honest note on sizing: AirTAC publishes flow as curves, not a single rated number, so send us your application details and we will confirm the flow figures from the datasheet before you commit.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this series as curves, not as a single rated figure, so we do not quote a number that could mislead. Tell us your line pressure, downstream setpoint and approximate air consumption, and we will confirm the flow figures from the datasheet for this exact 300-size, 1/2 in unit before you order.
L marks the low-pressure regulation type - the version of the GFR300 built for setpoints well below the standard range, which is why it is chosen for gentle-clamp and low-pressure actuator duties. The exact regulation window for the low-pressure type is not published in the catalogue sheet we transcribe, so confirm the range with us; the fitted square gauge reads the downstream pressure in psi.
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.