The AirTAC GFR300-08 AirTAC Filter Regulator NPT1/4 psi Gauge 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 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 AirTAC GFR300-08 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure steady in a single 300-size body. This configuration has a 1/4 in NPT port, the standard 40 um filter element, and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure drop across the element is high enough. The fitted round gauge reads in psi, and a reverse/check valve is included to hold downstream pressure if the supply drops.
This is a genuine AirTAC part from the GFR range, which spans sizes 200 to 600 with port options from 1/8 to 1 in, PT as the standard thread and G or NPT as order options, a choice of 40 um or 5 um filtration, and manual, automatic or differential-pressure drains. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR300-08 AirTAC Filter Regulator NPT1/4 psi Gauge |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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 — round, psi 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
Feeds a clamping cylinder circuit on a fabrication press: the 40 um element keeps welding-shop moisture and scale out of the valve stack, the regulator holds a repeatable clamping force, and the check valve holds the set pressure if the header dips mid-cycle.
Mounted at the drop point feeding diverters and pusher cylinders on a carton line: clean, regulated air keeps the divert actions consistent shift after shift, and the differential-pressure drain copes with condensate without daily manual blowing down.
Installed ahead of the tool-changer and chuck-actuation circuits on a CNC lathe: the 40 um filter protects the directional valves from particles, the regulator pins the actuation pressure, and the psi round gauge gives the operator a direct readout at the machine.
Size the unit by the flow your line needs: the 300 size carries a 1/4 in port, and larger sizes (400, 600) move more air through bigger ports, so step up if your demand sits near the top of a 300's curve. Choose the drain to suit the installation: differential-pressure (this unit) drains itself as the element loads, automatic drains on a cycle, and manual drain suits accessible, regularly attended positions. Pick the 40 um standard element for general air prep or the 5 um (W) element where finer protection matters. Thread is PT as standard; G and NPT are order options, and this unit is supplied in NPT. The round psi gauge is fitted here; embedded square gauges with MPa, psi or bar scales are available. Note this configuration has no mounting bracket.
Flow for GFR units is published as curves, not a single rated figure, so send us your application details and we will confirm the 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 GFR performance as flow curves rather than a single rated figure, so there is no one number we can honestly quote. Send us your application and we will confirm the flow figures from the datasheet on request before you order.
The C2 code in GFR30008JC2TK specifies an external round gauge with a psi scale. An embedded square gauge is the standard option, and MPa, psi or bar scales can be ordered - so pick the gauge style and scale that matches how your operators read the line.
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.