The AirTAC GFR300C08AF3TK AirTAC Filter Regulator, NPT1/4, Auto Drain 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 GFR300C08AF3TK is a 300-size filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single compact body. This configuration carries a 1/4 in NPT port, an automatic drain that ejects collected condensate without manual attention, a 40 um standard filter element, an embedded square gauge scaled in bar, a reverse/check valve that holds downstream pressure when the supply is lost, and a mounting bracket for panel or surface fixing. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulator adjusts from 0.15 to 0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is offered in 200, 300, 400 and 600 sizes with ports from 1/8 to 1 in, a choice of automatic, manual or differential-pressure drains, an optional 5 um element (code W), gauge scale options, and G, NPT or PT threads. Flow is published as curves rather than a single rating, so ask us to confirm sizing or any datasheet figure against your application before ordering.
| Model | GFR300C08AF3TK AirTAC Filter Regulator, NPT1/4, Auto Drain |
|---|---|
| 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) |
Fitted at the drop to a small pneumatic press or clinching station, this unit filters water and swarf from the shop air line and holds a steady regulated pressure so the press cylinder cycles consistently through the shift, with the automatic drain clearing condensate on its own.
On a carton sealing or case packing line, the GFR300C08AF3TK conditions the air feeding gripper and flap-folding cylinders: the 40 um element stops particulate reaching the valves, the regulator pins the working pressure, and the check valve holds the circuit if the main supply drops.
Mounted on the bracket beside a CNC machining centre's pneumatic cabinet, this filter regulator cleans and regulates the air feeding tool-change clamps and air blast nozzles, with the bar-scale square gauge giving the operator a direct reading at the machine.
Start with the port step: the 300 size takes a 1/4 in port here, and moving up to 400 or 600 buys more flow capacity at the cost of space, so match the size to the air demand of the circuit rather than the pipe alone. This unit has the automatic drain, which suits unattended duty; choose manual drain where you prefer controlled blow-down, or differential-pressure drain where the drain should trigger on bowl loading. The 40 um element is standard; specify the W code for the 5 um grade where finer particulate removal matters. The square gauge is fitted here scaled in bar; MPa and psi scales and an external round gauge are alternatives. Thread is NPT on this code, with PT as the catalogue standard and G (BSPP) orderable. A bracket is included, and the K code means the reverse/check valve is already fitted.
One honest note before you order: AirTAC publishes flow as curves, not a single rated figure, so we do not quote a flow number here. Send us your application details and we will confirm sizing against the datasheet curves on request.
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 we do not quote a number here. Send us your application details and we will confirm the flow and sizing against the datasheet curves on request.
K means a reverse (check) valve is fitted. If the upstream supply fails, the valve holds pressure downstream so actuators and clamps do not dump instantly - useful on fixtures and safety circuits. This unit also carries the automatic drain (A), a 40 um element, a square bar gauge and NPT 1/4 in threading.
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.