The AirTAC AirTAC GFR300-08 Filter Regulator, NPT 1/4 in, 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 GFR300-08 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single 300-size body. This unit is threaded NPT 1/4 in, has a manual drain bowl in polycarbonate, a 5 um filter element, and a built-in square pressure gauge scaled in MPa. Regulation covers 0.05-0.9 MPa (7-130 psi) with a maximum inlet pressure of 1.0 MPa (145 psi), and the unit operates from -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 in, and with automatic, manual or differential-pressure drains, 40 um or 5 um elements, a choice of gauge scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application.
| Model | AirTAC GFR300-08 Filter Regulator, NPT 1/4 in, 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 | 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, MPa 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 0.05 - 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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. |
| (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) |
Feeding carton sealers and case tapers on a packaging line: the 5 um element keeps water and debris out of the sealing cylinders while the regulator holds the cylinder pressure the line was set up with.
Point-of-use conditioning for a CNC machining center: clean, regulated air to the tool changer, clamps and air blast, with the square gauge giving a local pressure readout at the machine.
Regulating clamp cylinders on a pneumatic press or fixture station: the manual drain lets an operator bleed accumulated water at shift start, and the 5 um element protects the valve internals.
Size and port step up together: 200, 300, 400 and 600 cover 1/8 in to 1 in, so match the size to the flow your line needs - this unit is the 300 size with NPT 1/4 in ports. Drain choice matters: manual drains need someone to open the bowl, automatic drains discharge condensate on their own, and the differential-pressure default drains on a pressure drop. Element grade is 40 um standard or 5 um (code W) for finer protection; this unit carries the 5 um element. Gauges come as an embedded square gauge with MPa, psi or bar scales, or an optional external round gauge. Threads are PT standard with G and NPT as order options, and a mounting bracket is included. Flow is published as curves, not a single rating, so send us your application 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 - line pressure, downstream demand and acceptable pressure drop - and we will confirm the sizing from the datasheet on request.
This unit's code specifies a manual drain: someone opens the bowl drain to release collected water. The same GFR300 body is also available with an automatic drain or the differential-pressure default drain - tell us which you prefer when ordering. The 5 um element (code W) is likewise an option across the family.
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.