The AirTAC AirTAC GFR300-15MLJF2WK 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 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 GFR300-15MLJF2WK is a 300-size filter regulator that removes water and particulate from compressed air and holds a set downstream pressure in one body. This configuration is the low-pressure type, intended for circuits that run at reduced set pressures, and it carries the 5 um filter element (code W) for finer filtration than the standard 40 um grade. It has a manual-drain polycarbonate bowl, an embedded square gauge reading in psi, an integrated reverse/check valve, and a PT1/2 port with PT thread. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and with a choice of drain type, filter grade, gauge scale, thread (PT standard; G and NPT as order options) and mounting bracket. Because flow is published as curves rather than a single rating, we confirm flow and other datasheet figures for your application on request.
| Model | AirTAC GFR300-15MLJF2WK Filter Regulator 1/2 in Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (PT thread) |
| Filtering grade | 5 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 — 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". |
| 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). |
| 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) |
Filtered, low-pressure regulated air for clamp and fixture cylinders on a CNC machining cell, with the 5 um element protecting directional valves from particulate carryover.
Conditioned air for sealing jaws and actuator cylinders on a packaging conveyor, with manual drain letting maintenance staff bleed the bowl during planned changeovers.
Filtered, low-pressure regulated air feeding spray guns and air-assisted applicators in a finishing booth, where the 5 um grade supports cleaner coating work.
The real, decodable choices on this family are: the size and port step (here 300 size with a 1/2 in PT port), which you match to the flow your line needs; the drain type (this unit is manual drain, so condensate is bled from the bowl by hand on a schedule you control); the filter grade (this unit carries the 5 um W element instead of the 40 um standard); the gauge (embedded square gauge with psi scale here; MPa or bar scales and an external round gauge are the other catalogue choices); the regulator type (this is the low-pressure version); and the reverse/check valve, which is fitted on this code. Thread is PT as standard, with G (BSPP) and NPT available to order, and this unit is supplied without a mounting bracket. Flow for the 300 size is published as curves, not a single rating, so ask us to confirm sizing against your application before ordering.
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 this family as characteristic curves, not as a single rated figure, so there is no honest one-number answer we can print. Tell us your inlet pressure, set pressure and demand, and we will confirm the flow from the datasheet curves for your application on request.
M is the manual-drain option: condensate collected in the polycarbonate bowl is drained by hand, which suits duties where you want draining under operator control. The same GFR family is also available with automatic or differential-pressure draining if you would rather not rely on manual bleeding.
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.