The AirTAC GFR300C08AF3WTK AirTAC Filter Regulator NPT1/4 5 um is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has See datasheet 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 GFR300C08AF3WTK is a filter regulator: one body that removes water and particulate from compressed air and holds downstream pressure steady. This size 300 unit is threaded NPT1/4, carries a 5 um filter element for finer filtration than the standard 40 um grade, and drains condensate automatically, so the bowl does not depend on someone opening a manual drain. The built-in regulator adjusts from 0.15 to 0.9 MPa (20-130 psi), the embedded square gauge reads in bar, and a reverse/check valve is fitted to hold the set pressure if upstream supply drops. A mounting bracket is included.
This is a genuine AirTAC part. The GFR family spans sizes 200 to 600 with port sizes from 1/8 to 1 inch, a choice of drain types, 40 um or 5 um elements, gauge scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for this exact model on request.
| Model | GFR300C08AF3WTK AirTAC Filter Regulator NPT1/4 5 um |
|---|---|
| Series | GFR300 filter regulator |
| Port size | See datasheet (PT thread) |
| Filtering grade | 40 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 — factory standard, Factory standard 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. |
|---|---|
| C0 | Port size See datasheet. 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). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| (blank) | PT 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 · See datasheet · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-C0 (two-unit set) |
Feeding clean, regulated air to the tool-clamp and pallet-change circuits of a CNC machining centre, where the 5 um element protects precision valves and the check valve holds clamp pressure through a supply dip.
Conditioning air for the cylinders and diverters on a carton packaging conveyor, with the automatic drain keeping condensate out of the circuit on a line that runs unattended across shifts.
Supplying filtered, regulated air to sample-handling actuators and purge jets on a laboratory automation platform, where the 5 um grade and a bar-scale gauge keep the supply consistent and observable.
Size 300 with a 1/4 in port suits lines where the 200 size would restrict flow and the 400 would be oversized; step up or down a size if your circuit sits between ports. The 5 um element (code W) is the right pick when downstream valves or instruments want cleaner air than the standard 40 um grade. Automatic drain suits unattended or hard-to-reach installations; manual and differential-pressure drains are the alternatives if you prefer controlled blowdown. The square gauge reads in bar; MPa and psi scales are available, and an external round gauge is an option. NPT is ordered as a thread option - PT is the catalogue standard, and G (BSPP) is also listed. A bracket is included with this model.
Because flow is published as curves and not a single rated figure, send us your application details 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 GFR300 series as curves, not as a single rated number, so we do not quote a figure here. Tell us your line pressure and the flow your application needs, and we will confirm the datasheet curve for this exact model on request before you order.
The A in the code sets the automatic drain: the bowl ejects condensate on its own instead of waiting for a manual drain to be opened, which suits unattended installations. The W sets the 5 um filter element, one grade finer than the 40 um standard, for circuits feeding sensitive valves or instruments.
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.