The AirTAC GFR300-08 AirTAC Filter Regulator, NPT 1/4 in, 5 um 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 holds downstream pressure steady, in one body. This configuration carries a 1/4 in NPT port, a 5 um filter element (finer than the 40 um standard), an automatic drain that purges collected condensate without manual attention, an embedded square gauge scaled in MPa, and a built-in reverse/check valve. A mounting bracket is included, the polycarbonate bowl allows visual checks of the condensate level, and 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) at -5 to 70 C (non-freezing).
This is a genuine AirTAC part from the GFR300 series. GFR filter regulators span sizes 200 to 600 with ports from 1/8 to 1 in, plus drain, filter-grade, gauge, thread and bracket options to match the installation. Flow is published as curves rather than a single rating, so ask us to confirm sizing and any datasheet figure for your application before ordering.
| Model | GFR300-08 AirTAC Filter Regulator, NPT 1/4 in, 5 um |
|---|---|
| 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, 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". |
| 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. |
| (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) |
Mounted ahead of the pick-and-place and capping cylinders on a bottling line, it strips condensate and fine particles from the shop air and holds a steady set pressure so bottle handling stays repeatable through each shift.
On a machining cell where pneumatic clamps and vises grip workpieces, the 5 um element protects the clamp valves from fine contamination while the regulator locks the clamping pressure, and the check valve holds the circuit if supply pressure dips.
Feeding analytical and test-bench instruments that need clean, closely held air, the fine 5 um filtration and automatic drain keep the supply dry and particle-free without an operator having to visit the drain bowl daily.
Size and port set the capacity: the GFR300 with its 1/4 in port steps up from GFR200, while GFR400 and GFR600 carry larger ports for higher demand. This unit pairs a 5 um element (code W) with an automatic drain (code A) - choose the 40 um standard element for coarser general protection, and manual or differential-pressure drain where an auto purge is not required. The embedded square MPa gauge is standard; an external round gauge in MPa, psi or bar scale is optional, and G (BSPP) or PT threads can be ordered in place of NPT. Flow is published as curves, not a single rating, so send us your flow and pressure requirements 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. The reflux valve permits reverse flow 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 l/min or SCFM number. Tell us your required flow and working pressure and we will confirm sizing against the datasheet on request before you order.
In the model code, W selects the optional 5 um element instead of the 40 um standard, and A selects the automatic drain instead of the default differential-pressure type. The 5 um grade suits points of use that need finer protection, and the automatic drain purges condensate on its own - useful where the unit sits in a location that is not checked daily.
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.