The AirTAC AirTAC GFR300-08 Filter Regulator G1/4, 5 um, Auto 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 PT1/4" ports, a automatic 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 300 size with a G1/4 (BSPP) port, a 5 um filter element (code W), an automatic drain that expels collected condensate on its own, and the low-pressure regulator type. A square pressure gauge scaled in psi is fitted as standard, the bowl is polycarbonate (PC) as appropriate for the 300 size, and a mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing).
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 can be ordered with manual or differential-pressure drains, the 40 um standard element, MPa or bar gauge scales, an external round gauge, a reverse/check valve, and PT or NPT threads. Flow is published only as curves rather than a single rated figure, so ask us to confirm flow and other datasheet values for your application before ordering.
| Model | AirTAC GFR300-08 Filter Regulator G1/4, 5 um, Auto Drain |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 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 | Automatic 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 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. |
| G | G (BSPP) 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) |
Filtered, regulated air to the sealing cylinders and directional valves on a carton-closing line; the automatic drain keeps condensate out of the valve stack during continuous shifts without an operator having to bleed the bowl.
Point-of-use supply for spray guns in a finishing booth: the 5 um element addresses water and particulate ahead of the gun while the regulator holds the gun supply steady, and the automatic drain suits a booth that runs all day.
Regulated supply to clamp and fixture cylinders on a CNC machining cell, with the low-pressure regulator type specified for circuits that run at reduced set pressures - ask us to confirm the exact adjustment range before ordering.
The real choices in this family are all decodable from the code. Step through sizes 200/300/400/600 and ports 1/8 to 1 in to match the air demand of the line - this 300 size with G1/4 suits compact machines and point-of-use drops. Choose the drain: automatic (this unit, code A) for unattended condensate removal, manual where you want operator control, or the differential-pressure default. Choose the element: 40 um standard or 5 um (code W, as here) for finer protection. Gauges are the embedded square type with MPa, psi or bar scales, or an optional external round gauge; threads can be PT (the standard), G or NPT; and a bracket is included unless code J is specified. This unit is the low-pressure regulator type - its exact adjustment range is not published, so confirm it with us. Flow is published as curves, not a single rating, so send us your air demand 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 the GFR series as curves rather than a single rated figure, so we do not quote a number here. Send us your application's air demand and we will confirm the flow from the datasheet on request before you order.
This unit carries code A: an automatic drain that expels collected condensate without operator attention, which suits machines that run unattended. The GFR300 family can also be ordered with a manual drain or the differential-pressure (blank-code) drain. Tell us your drain preference and set pressure and we will confirm the right version and its adjustment range.
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.