The AirTAC AirTAC GFR300-08 Low-Pressure Filter Regulator NPT 1/4 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 PT1/4" 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 GFR30008MLJC2WTK is an AirTAC GFR filter regulator: a 5 um filter element and a low-pressure regulator combined in one body, size 300, with a 1/4 in NPT port. The M code selects a manual drain, so collected water and dirt are bled from the polycarbonate bowl by hand during routine service. The C2 code fits an external round gauge reading in psi, and the K code fits a reverse (check) valve. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature is -5 to 70 C (non-freezing). This unit is supplied without a mounting bracket.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options for drain type, 40 um or 5 um filtration, gauge style and scale (MPa, psi or bar), G or NPT threads, brackets and a check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing figures from the datasheet for your application.
| Model | AirTAC GFR300-08 Low-Pressure Filter Regulator NPT 1/4 |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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 — 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. |
|---|---|
| 08 | Port size PT1/4". 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. |
| 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. |
| 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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Filtered, regulated air at reduced pressure for pneumatic clamps and swing cylinders on an assembly fixture, with the 5 um element protecting downstream valve seats from fine particulate.
Regulated low-pressure air for guide rails, pushers and sealing jaws on a packaging conveyor, with the psi gauge for operator setting and the manual drain for end-of-shift water bleed-off.
A clean, low-pressure air supply for bench-scale and pilot test rigs, where the 5 um filtration grade and a visible psi gauge help keep test conditions repeatable run to run.
The real choices in this code are: size 300 with a 1/4 in NPT port (step up to 400 or down to 200 as your flow and piping demand); the 5 um element (W) instead of the 40 um standard; a manual drain instead of automatic or differential-pressure; the low-pressure regulator type (L) rather than standard; a round external gauge reading in psi; and NPT thread instead of the PT standard (G is also an order option). No mounting bracket is fitted. Because flow is published as curves, not a single rated number, send us your flow and pressure requirements and we will confirm the right size from the datasheet 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 curves rather than a single rated figure, so we do not quote a number here. Send us your flow and pressure requirements and we will confirm the sizing from the datasheet on request.
The W in the code selects the optional 5 um element instead of the 40 um standard, for finer particulate removal. M selects a manual drain, so water is bled from the polycarbonate bowl by hand during service rather than automatically. L makes it a low-pressure regulator rather than the standard type, and K fits a check valve. Exact adjustment figures for the low-pressure type are not published; we can confirm details on request.
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.