The AirTAC GFR300-08L NPT1/4 AirTAC Filter Regulator 5 um, Bar Gauge 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 AirTAC GFR30008LJC3WTK is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 300 size with a 1/4 in NPT port, built as the low-pressure regulator type (code L) with a 5 um filter element (code W), a differential-pressure drain, a round external gauge scaled in bar (C3), and a reverse/check valve fitted (code K). No mounting bracket is included (code J). The polycarbonate bowl suits the 300 size, and the unit carries a maximum inlet pressure of 1.0 MPa (145 psi) with an operating temperature of -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and options across drain type, 40 um or 5 um filtration, gauge style and scale, PT/G/NPT threads, brackets and a reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing and any datasheet figure for your application before ordering.
| Model | GFR300-08L NPT1/4 AirTAC Filter Regulator 5 um, Bar Gauge |
|---|---|
| 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 | Low-pressure 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, bar 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. The low-pressure type adjusts over a lower band than standard; we confirm the exact figures from the factory datasheet. 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)). |
| L | Low-pressure 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. |
| 3 | Gauge scale: bar. 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) |
Point-of-use air prep for a machining cell's clamping fixtures: the 5 um element cleans the supply ahead of the low-pressure regulator that sets clamp pressure, with the bar gauge giving operators a direct local reading.
Mounted at the drop of a packaging conveyor's air supply, this unit filters water and swarf from the shop air and holds a steady low pressure to the sealing and flap-fold cylinders, with the check valve holding the set circuit.
Feeding spray guns and rinse nozzles in a lab or finishing station where finer air cleaning is wanted: the 5 um grade polishes the supply while the low-pressure regulator trims it down to the gentle working pressure the station needs.
Choose the GFR300 when your line size and expected flow sit at the 1/4 in step of the 200/300/400/600 range; step up or down a size if your circuit sits between steps. This unit is already specified with the choices that matter: 5 um filtration instead of the standard 40 um, a differential-pressure drain (the default, no manual or automatic bowl), a round bar gauge instead of the embedded square type, NPT thread instead of the PT standard (G and NPT are order options), and a fitted check valve. It is the low-pressure regulator type, and no bracket is included. Flow for this family is published as curves, not a single rating, so 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR family as curves rather than a single rated figure, so we do not quote a number that is not on the datasheet. Tell us your inlet pressure, downstream demand and line length, and we will confirm the sizing and the exact datasheet figures for this model on request before you order.
L marks the low-pressure regulator type, an alternative to the standard regulator for circuits that work at lower pressures; the exact adjustment range for the low-pressure type is not published on our sheet, so ask us to confirm it. K means a reverse/check valve is fitted in this unit; the same model without K has none. The C3 in the code is the round gauge scaled in bar, and W is the 5 um filter element.
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.