The AirTAC GFR300-08 AirTAC Filter Regulator G1/4 5 um Round Gauge 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 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 GFR300-08 is a 300-size filter regulator that cleans compressed air and holds a stable downstream pressure in a single body. This configuration carries a G1/4 (BSPP) port, a 5 um filter element for finer removal of water and particulate than the 40 um standard, a differential-pressure drain that bleeds accumulated condensate automatically as pressure drops, and a fitted round pressure gauge reading in psi. Mounting bracket is not included with this code.
This is a genuine AirTAC part in the GFR300 series, one of four sizes (200/300/400/600) with a full spread of port sizes, thread options (PT standard, G and NPT to order), drain types, filter grades and gauge choices. Rated flow is published by AirTAC as curves rather than a single figure, so we confirm the datasheet numbers for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator G1/4 5 um Round Gauge |
|---|---|
| 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 | 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 — round, 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. 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. |
|---|---|
| 08 | Port size PT1/4". 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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) |
Conditioning and regulating the air feeding spray guns and atomising valves, where the 5 um element helps keep moisture and fine particles out of the finish and the gauge lets operators set and check the gun supply pressure in psi.
Supplying cleaned, regulated air to the cylinders and grippers on a packaging conveyor, with the differential-pressure drain shedding condensate through shift after shift and the round gauge giving a visible setpoint for the machine's air circuit.
Point-of-use filtration and pressure control ahead of analysers, test rigs and pneumatic bench equipment, where the 5 um grade and a stable regulated output protect sensitive instruments from water and particulate in the shop air.
Size 300 with a G1/4 port is a common mid-range step: move up to 400 or 600 where the line draws more air, down to 200 for compact circuits - and ask us to confirm the flow curve against your demand before ordering, since AirTAC publishes flow as curves, not one rated number. The 5 um element in this code suits points of use that see finer contamination than the 40 um standard handles; the differential-pressure drain needs no operator attention but relies on pressure changes to purge. The fitted round gauge reads in psi; MPa and bar scales and an embedded square gauge are alternatives in the range. G thread is fitted here (PT is the standard thread form, G and NPT are order options), and a mounting bracket can be ordered if this code's no-bracket build does not suit your panel.
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 GFR300 series as curves, not as a single rated figure, so there is no one number we can honestly quote. Send us your line pressure, downstream setpoint and air demand, and we will confirm the sizing from the datasheet curves before you order.
The 5 um element (code W) removes finer water and particulate than the 40 um standard, which suits spray, instrumentation and other cleaner-air points of use. The differential-pressure drain is the default drain type: it purges collected condensate automatically as pressure changes, with no manual draining routine, unlike the optional automatic or manual drain variants in the 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.