The AirTAC GFR300-08F1WTK AirTAC Filter Regulator NPT1/4 5um 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 GFR300-08F1WTK is an AirTAC GFR300 filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure. This configuration is built for 1/4 in NPT ports, carries the fine 5 um filter element (the W grade, tighter than the standard 40 um), and drains condensate by differential pressure, so the bowl purges as the pressure differential across the element builds during normal operation. The embedded square gauge reads in MPa, a reverse/check valve is fitted to hold downstream pressure when the supply is removed, and a mounting bracket is included for secure panel or frame fixing.
This is a genuine AirTAC part from the GFR300 size class, one of four sizes (200/300/400/600) spanning port sizes from 1/8 in to 1 in. Across the G-series you can order alternative thread options (PT standard, G or NPT), manual or automatic drains, a 40 um element, external round gauges with MPa, psi or bar scales, and low-pressure regulator variants. Rated flow for this unit is published as curves rather than a single figure, so ask us and we will confirm the datasheet figures against your application before you order.
| Model | GFR300-08F1WTK AirTAC Filter Regulator NPT1/4 5um |
|---|---|
| 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 | Fitted (reverse flow permitted) |
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. |
| (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. |
| K | Reverse-flow (reflux) valve fitted. |
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 bench-mounted pneumatic press or clamping fixture at 1/4 in, where the 5 um element protects the directional valve and cylinder seals from water and fine particles while the regulator holds a stable set pressure stroke to stroke.
Supplying air to conveyor stopper, pusher and divertor cylinders on a packaging line, with the check valve holding the downstream circuit pressurised during supply dips and the differential-pressure drain keeping the bowl clear through continuous shifts.
Conditioning supply air for bench-top test rigs, air bearings or instrumentation panels where finer 5 um filtration and a closely held regulated pressure protect sensitive components, with the MPa gauge giving a clear local set-point reading.
Size 300 with 1/4 in NPT ports suits lines plumbed at 1/4 in; step up to size 400 or 600 when the circuit demands more flow, or down to size 200 for compact drops. The 5 um element in this unit is the right choice when downstream valves, cylinders or instruments need finer protection than the standard 40 um grade. The differential-pressure drain is the fit-and-forget option; specify an automatic drain for unattended condensate purge or a manual drain where an operator drains the bowl routinely. The fitted square gauge reads in MPa; psi and bar scales and an external round gauge are orderable alternatives. PT is the standard thread, with G and NPT as orderable options - this unit is specified with NPT. A mounting bracket is included.
Because flow data is published as curves rather than one rated number, send us your application details and we will confirm the datasheet figures and sizing before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this unit as performance curves rather than a single rated figure, so we do not quote one number. Tell us your application and we will confirm the datasheet flow figures against your required flow and pressure before you order.
The W code in the model specifies the 5 um filter grade instead of the standard 40 um element, giving finer removal of water and particulate for sensitive downstream equipment. The K code specifies a reverse/check valve, which holds downstream pressure if the upstream supply is lost. Both are factory build options, so order the exact code you need.
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.