The AirTAC AirTAC GFR300-08MJF3TK Filter Regulator 1/4in NPT 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 PT1/4" 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 AirTAC GFR300-08MJF3TK is a size 300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration has a 1/4 in NPT port, a manual drain on the bowl, a 40 um standard filter element, an embedded square gauge scaled in bar, and a reverse (check) valve fitted. It is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). The bowl on this size is polycarbonate (PC). The regulation range for this manual-drain unit is 0.05-0.9 MPa (7-130 psi).
This is a genuine AirTAC part. The GFR300 series is one of four sizes (200, 300, 400, 600) with port options from 1/8 in to 1 in, PT, G or NPT threads, manual, automatic or differential-pressure drains, a 5 um element option (code W), gauge scale choices, and an optional reverse valve. Rated flow for this series is published as curves rather than a single figure; ask us and we will confirm the datasheet figures for your application.
| Model | AirTAC GFR300-08MJF3TK Filter Regulator 1/4in NPT |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 130 psi) |
| Pressure type | Standard 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, 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 130 psi). 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)). |
| (blank) | Standard 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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Clean, regulated air to a machining centre's clamping fixtures and tool-change cylinders, with the check valve holding the set pressure if the supply dips.
Feeding carton-sealing and wrapping machine cylinders on a packaging line, where the manual-drain bowl is bled during shift changeovers and the bar gauge gives operators a set point.
Supplying the air cylinders that divert cartons on a distribution conveyor, with the 40 um element keeping wear particles out of the directional valves.
Size 300 with a 1/4 in NPT port suits lines whose piping and air demand sit in that band; step up to size 400/600 or down to size 200 if your flow requirement differs - we will confirm sizing against the published flow curves before you order. This unit has a manual drain, so someone must bleed the bowl periodically; choose the automatic or differential-pressure drain variant if the installation is unattended. The 40 um element is the standard grade; specify the W variant for 5 um filtration. The fitted square gauge reads in bar; MPa and psi scales are available, and an external round gauge is optional. NPT is the thread on this code; PT and G (BSPP) are order options. A mounting bracket can be added if you need one.
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 GFR300 series as curves, not as a single rated number, so we do not quote a figure that is not in the datasheet. Tell us your inlet pressure and required downstream flow and we will confirm the sizing from the datasheet curves before you order.
Manual drain (code M) means the bowl must be bled by hand at intervals, which suits attended lines with scheduled maintenance. If the regulator sits in an unattended or hard-to-reach spot, order the automatic (A) or differential-pressure (blank) drain variant of the same GFR300 size instead; the filtration and regulation function is otherwise the same.
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.