The AirTAC GFR300-08MLF2WT AirTAC Filter Regulator NPT1/4, 5 um 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 AirTAC GFR300 series combines water and particulate filtration with pressure regulation in a single compact body, so one component both cleans the compressed air and holds the downstream pressure where your circuit needs it. This unit is the size 300 frame with 1/4 in NPT ports (PT is the catalogue standard; G and NPT are order options), a fine 5 um filter element (code W, in place of the standard 40 um), a manual drain on the polycarbonate bowl, and the low-pressure regulator type. It carries the embedded square pressure gauge with a psi scale, includes a mounting bracket, and is not fitted with a reverse/check valve. 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 published in sizes 200, 300, 400 and 600, with port sizes from 1/8 in to 1 in, a choice of drain type, standard or 5 um filtration, gauge scale options and thread variants, so you can match the unit to your line rather than compromise. Because flow is published as curves rather than a single rating, we confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08MLF2WT AirTAC Filter Regulator NPT1/4, 5 um |
|---|---|
| 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 — 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. |
|---|---|
| 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. |
| (blank) | Mounting bracket included. |
| (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 · PT1/4" · 5 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a fixture-clamping circuit, this unit filters the shop air to 5 um and holds a steady, low set pressure to the clamp cylinders, with the psi square gauge giving the operator a direct read of the setting.
Feeding a carton-sealing or wrapping machine, the combined filter-regulator cleans water and particulate from the plant supply and regulates the pressure to the machine's air cylinders, with the manual drain bled during shift checks.
For a bench-top coating or spray station that runs at modest pressures, the low-pressure regulator type and fine 5 um element deliver clean, gently regulated air to the applicator, protected by the polycarbonate bowl.
Start with the port and size step: this unit is size 300 with NPT1/4 ports; larger sizes (400, 600) carry larger ports and more flow capacity, so step up if your line's air demand is near the top of a 1/4 in circuit. On filtration, the standard element is 40 um; this unit carries the 5 um (W) element, the right choice when downstream valves or instruments need finer air. Drain choice matters: this configuration has a manual drain, which you bleed by hand - an automatic drain or the default differential-pressure drain are available if you cannot schedule manual bleeding. The gauge here is the embedded square type with a psi scale (MPa and bar scales are alternatives, and an external round gauge is optional). This is the low-pressure regulator type; its set-point range is not published on the sheet we work from, so ask us to confirm it against your operating pressure before ordering. Thread is NPT here; PT is the catalogue standard and G is also available. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before you order.
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 rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application and line pressure and we will confirm the sizing from the datasheet on request.
This configuration is coded M for a manual drain: the polycarbonate bowl collects water and you drain it by hand. If you cannot schedule manual bleeding, the same size 300 filter regulator is available with an automatic drain (code A) or the default differential-pressure drain - just ask for the variant that suits your maintenance routine.
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.