The AirTAC GFR300-08 NPT1/4 AirTAC Filter Regulator 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 sets downstream pressure in a single compact body, so one component does the work of a filter and a regulator. This 300-size unit is specified with a 1/4 in NPT port, a fine 5 um filtration element (the W grade, finer than the standard 40 um), an automatic drain that expels collected condensate without manual attention, and an embedded square gauge reading in bar. The regulator is the standard type with a 0.15-0.9 MPa (20-130 psi) adjustment range, no reverse/check valve is fitted, and no mounting bracket is included.
This is a genuine AirTAC part from the G-series filter-regulator line, which spans 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, a choice of automatic, manual or differential-pressure drains, 40 um or 5 um filtration, gauge scale options, and PT (standard), G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application on request.
| Model | GFR300-08 NPT1/4 AirTAC Filter Regulator 5 um Auto Drain |
|---|---|
| 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, bar 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". |
| A | Drain: Automatic 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. |
| 3 | Gauge scale: bar. 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 a press-shop punch or forming machine, where the 5 um element protects directional valves from particulate and the regulator holds a steady working pressure for consistent stroke force.
Conditioning air for cylinder-driven packaging and cartoning equipment on a conveyor line, with the automatic drain keeping condensate out of the supply during continuous shifts.
Supplying clean, regulated air to benchtop lab or test-rig apparatus, where the fine 5 um grade and a bar-scaled gauge give the operator a visible, stable setpoint.
Size and port step up together across the G-series: 200, 300, 400 and 600, with ports from 1/8 in to 1 in, so pick the size whose flow curve covers your demand with margin - we can check the curve against your consumption before you order. This unit already carries the finer 5 um element (W); the standard grade is 40 um if your application does not need fine filtration. Drain options are automatic (fitted here), manual, or the default differential-pressure type. The embedded square gauge is standard and this one reads in bar; MPa and psi scales and an external round gauge are alternatives. Thread is NPT on this code - PT is the catalogue standard, with G and NPT as order options. Note that no mounting bracket is included with this J-coded unit.
Be aware that flow for this family is published only as curves, not a single rated figure, so 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 this family as curves rather than a single rated figure, so there is no one l/min or SCFM number we can quote. Send us your air consumption and line pressure and we will confirm the flow curve and correct sizing from the datasheet on request.
The A in this code means the bowl drains itself: collected condensate is expelled automatically with no operator attention, which suits unattended or continuously running equipment. The catalogue also offers manual (M) and the default differential-pressure drain, and the bowl on this 300 size is polycarbonate (only the 600 size uses aluminium alloy).
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.