The AirTAC GFR300-15 AirTAC Filter Regulator NPT1/2 5 um Manual Drain 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 GFR300-15MLJC1WTK is a GFR-series filter regulator: filtration and pressure regulation combined in a single body, so one unit removes water and particulate from compressed air and holds a regulated downstream pressure. This configuration is the 300 size with a 1/2 in NPT port, a 5 um filter element (the W grade, finer than the 40 um standard), a manual drain on the PC (polycarbonate) bowl, the low-pressure regulator type, a round gauge with MPa scale, and a reverse (check) valve fitted. No mounting bracket is included. 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 port sizes from 1/8 in to 1 in, a choice of PT (standard), G or NPT thread, differential-pressure, automatic or manual drains, 40 um or 5 um filtration, gauge options, and an optional reverse valve. AirTAC publishes flow for this series as curves rather than a single rated figure, so ask us to confirm flow and datasheet figures against your application before ordering.
| Model | GFR300-15 AirTAC Filter Regulator NPT1/2 5 um Manual Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/2" (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, MPa 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). |
| C | Gauge shape: Round. C is round, F is square. |
| 1 | Gauge scale: MPa. 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-15 (two-unit set) |
Supply filtered, regulated air to the clamping cylinders that hold workpieces in a machining cell. The 5 um element protects the clamping valves from particulate and water, the low-pressure regulator type suits circuits held at modest pressure, and the fitted reverse valve covers circuits that need one.
Feed the pick, fold and seal cylinders of a carton-erecting machine from a single filter regulator. The manual drain lets maintenance drain the PC bowl at shift start, and the round MPa gauge gives the line technician a direct pressure reading at the machine.
Regulate clean air to the pneumatic control panel of a pilot or bench-scale process rig. The 5 um grade suits instruments and small control valves, the low-pressure regulator type matches circuits run at reduced pressure, and the check valve is already fitted where the loop requires it.
For this family the real choices are all in the code. The 300 size steps up from 200 in port and flow capacity - match the 1/2 in NPT port to your piping and expected demand. The W code selects the 5 um element over the 40 um standard; choose it where downstream valves and instruments need cleaner air. The M code is a manual drain, so the PC bowl is drained by hand on a routine you set; automatic and differential-pressure drains are available in the same series if you would rather not drain manually. This is the low-pressure regulator type; its exact adjustment range is not published in our data, so confirm the range with us before ordering. The C1 code fits a round gauge with MPa scale; psi and bar scales and a square gauge are alternatives. NPT here is an order option - PT is the catalogue standard thread, and a bracket can be added if you need panel or surface mounting. Flow for the GFR series 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 the GFR series as curves rather than a single rated figure, so we do not quote a rated flow number for this unit. Send us your inlet pressure, regulated pressure and expected air demand, and we will confirm sizing from the datasheet on request before you order.
The W code selects the 5 um filter element instead of the 40 um standard, which suits downstream valves and instruments that need cleaner air. The M code is a manual drain: the PC (polycarbonate) bowl is drained by hand on a schedule you set. If you would prefer not to drain manually, the same GFR300 series is available with automatic or differential-pressure drains.
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.