The AirTAC GFR300-08G AirTAC Filter Regulator G1/4 Low-Pressure 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 GFR300-08LJC2GK is a filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure. This configuration is the size-300 unit with a G1/4 (1/4 in) G-thread port, the low-pressure regulator type, a differential-pressure drain, the standard 40 um filter element, a round gauge reading in psi, and a built-in reverse (check) valve; no mounting bracket is included. It is rated to 1.0 MPa (145 psi) maximum inlet pressure, works in -5 to 70 C (non-freezing), and has a polycarbonate bowl.
This is a genuine AirTAC part from the GFR series, offered in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um (W) filtration, gauge or no-gauge builds, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing and datasheet figures for your application before ordering.
| Model | GFR300-08G AirTAC Filter Regulator G1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (G (BSPP) thread) |
| Filtering grade | 40 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, 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. 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. |
| 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. |
| G | G (BSPP) 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) |
Feeding filtered, regulated air to the cylinders and actuators on a carton-sealing or wrapping machine that runs at low pressure, with the reverse valve and round psi gauge built into the supply point.
Conditioning supply air for a pneumatic clamping or workholding fixture on a machining cell that operates below standard regulator settings, with 40 um filtration ahead of the valve stack.
Preparing pilot air for pneumatically actuated process valves on a plant line, with the round psi gauge giving a local pressure readout at the panel and the check valve in the circuit.
The real choices on a GFR are the size and port step (200 to 600, 1/8 to 1 inch), the drain type (differential-pressure as here, automatic, or manual), the filter grade (40 um standard or 5 um with code W), the gauge (embedded square standard, external round optional, in MPa, psi or bar scales), the thread (PT standard, G or NPT to order), and whether a bracket is fitted. This unit is the low-pressure type with a round psi gauge and a reverse (check) valve. Flow is published as curves, not a single rating, so send us your flow and pressure requirements and we will confirm the right size 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 flow as curves rather than a single rated figure, so we do not quote a number here. Send us your flow and pressure requirements and we will confirm the datasheet curve for this G1/4, size-300 unit against your application before you order.
The L in the code marks the low-pressure regulator type, intended for circuits that run below the settings of the standard version. The exact adjustment range for the low-pressure build is not published in the catalogue sheet, so confirm it with us for your set pressure. This unit also carries a reverse (check) valve (K), a round gauge reading in psi (C2), and no mounting bracket (J).
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.