The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 5 um, Square 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 300-size unit is fitted with a 1/4 in NPT port, a 5 um filter element (the finer of the two catalogue grades), a differential-pressure drain that bleeds collected condensate automatically as flow passes through, and an embedded square pressure gauge reading in MPa. The standard regulator covers an adjustment range of 0.15-0.9 MPa (20-130 psi), with a maximum inlet pressure of 1.0 MPa (145 psi) and an operating temperature of -5 to 70 C (non-freezing). The bowl on this 300 size is polycarbonate (PC); only size 600 uses aluminium alloy. No mounting bracket is included with this configuration.
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in, PT as the standard thread and G or NPT as orderable options, plus drain, filter-grade, gauge and bracket choices. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 5 um, Square Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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 — 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 0.15 - 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). |
| 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) |
On an assembly cell with air-powered clamps and a small pneumatic press, the GFR300-08 cleans the supply air to 5 um and holds a set working pressure at the fixtures, with the square gauge giving the operator a direct MPa reading at the drop.
Carton sealers, case packers and labelling heads on a packaging line run on 1/4 in air drops; this filter regulator conditions each drop, and the differential-pressure drain keeps condensate from carrying over into the machine's valves during continuous runs.
Bench-top test rigs and lab pneumatic circuits need clean, stable air at a repeatable setting; the 5 um element and fine regulation range make this unit a tidy single-body conditioning point ahead of precision fittings and instruments.
Size and port step up together: 200, 300, 400 and 600 carry progressively larger ports (here 1/4 in NPT) and higher flow capacity, so pick the size whose published flow curve covers your demand with margin - we can check the curve against your consumption if you send the figures. This unit pairs a 5 um element (code W) with the standard 40 um alternative available in the family; choose 5 um where downstream valves, cylinders or instruments need cleaner air. Drain options are differential-pressure (fitted here), automatic (A) or manual (M). The embedded square gauge reads MPa; external round gauges and psi or bar scales are orderable. Thread is NPT on this code, with PT standard and G available to order. Brackets are optional on GFR. Because flow is published as curves, not a single rating, ask us to confirm sizing against your application before ordering.
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, not as a single rated figure, so we do not quote a number here. Tell us your line pressure and air consumption and we will confirm the flow curve from the datasheet and check the sizing against your application on request.
The W in the code GFR30008JF1WT selects the 5 um filter grade, the finer of the two catalogue options (40 um is standard). Drain is differential-pressure: collected condensate is discharged automatically as air flows through, with no drain fitting to operate manually. Automatic (A) and manual (M) drains are available as alternative configurations in 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.