The AirTAC GFR300C08ALF3T AirTAC Filter Regulator NPT1/4, Auto Drain 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 See datasheet ports, a differential-pressure drain and regulates 0.15 - 0.9 MPa (20 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR300C08ALF3T is a filter regulator: one body that removes water and particulate from compressed air and holds a controlled downstream pressure. This configuration is built on the GFR300 size with a 1/4 in NPT port, the 40 um standard filter element, an automatic drain that ejects collected condensate without anyone opening it, and a low-pressure regulator fitted with an embedded square gauge scaled in bar. The metal bowl and the included mounting bracket let it sit directly on a machine's air-prep plate.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with ports from 1/8 in up to 1 in, PT as the standard thread and G or NPT as order options, a choice of 40 um or 5 um (code W) filtration, and differential-pressure, automatic or manual drains. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR300C08ALF3T AirTAC Filter Regulator NPT1/4, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — factory standard, Factory standard 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 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. |
|---|---|
| C0 | Port size See datasheet. This body offers 08 = PT1/4", 10 = PT3/8", 15 = PT1/2". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Feeds clean, moisture-picked air to the box-flap and taping cylinders on a packaging machine, with the low-pressure regulator holding the steady supply pressure those actuators are set up for and the automatic drain keeping condensate out of the valves between shifts.
Conditions the air feeding a paint spray booth, filtering water and particulate before the gun circuit and letting the operator dial in the lower regulated pressure the atomizing circuit runs at, read directly off the bar-scaled square gauge.
Supplies filtered, regulated air to the clamp cylinders on a CNC fixture, where a stable low clamp pressure protects the workpiece and the automatic drain keeps moisture out of the clamp circuit during unattended runs.
Step up through the family by size and port: this GFR300 carries a 1/4 in NPT port, while sizes 400 and 600 move up to 3/8 in through 1 in for larger air demand. The L in this code marks the low-pressure regulator type, intended where the controlled pressure sits below the standard type's range; the exact adjustment window for the L type is not published, so ask us to confirm it against your setpoint before ordering. Drain choice matters in practice: the automatic drain here discharges condensate on its own, while manual and differential-pressure drains suit installations that are checked routinely. Filtration is the 40 um standard element; specify code W for the 5 um element when downstream equipment needs finer protection. Gauge scale is bar on this unit, with MPa and psi scales selectable in the family. Flow is published as curves, not a single rating, so send us your flow and pressure requirements and we will confirm sizing against the datasheet 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 family as curves, not as a single rated figure, so there is no one number we can honestly quote. Send us your inlet pressure, setpoint and the downstream demand, and we will confirm the sizing from the datasheet on request before you order.
The automatic drain ejects the water and contaminants collected in the metal bowl on its own, so the unit keeps protecting the downstream circuit without anyone bleeding it daily. It suits enclosed machines and cells that run unattended. If your installation is checked routinely, the GFR family also offers manual and differential-pressure drains on the same sizes.
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.