The AirTAC AirTAC GFR300C08LJC2W Filter Regulator PT1/4 5um 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 GFR300C08LJC2W is an AirTAC GFR-series filter regulator: a 5 um filter and a pressure regulator combined in one body, so the air is cleaned and its working pressure set in a single size-300 unit. This configuration has a PT1/4 port, a 5 um filter element (code W), a differential-pressure drain, the low-pressure regulator type, an external round pressure gauge reading in psi, no mounting bracket and no reverse/check valve. The metal bowl collects the water and particulate dropped out of the compressed air; maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The low-pressure type is intended for circuits set below the standard regulator's range - confirm the exact adjustment range for this variant with us.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with larger sizes taking larger ports and more flow. Across the family you can order a 40 um standard or 5 um (W) filter element, a differential-pressure, automatic or manual drain, an embedded square gauge or an external round gauge with MPa, psi or bar scales, PT, G or NPT threads, and bracket or no-bracket mounting. Flow is published as curves rather than a single rating, so send us your application and we will confirm the figures from the datasheet before you order.
| Model | AirTAC GFR300C08LJC2W Filter Regulator PT1/4 5um |
|---|---|
| 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) |
On a CNC clamping circuit that holds workpieces at a low set pressure, this filter regulator cleans the supply air down to 5 um to protect the clamping valves, then holds the reduced clamp pressure steady so parts are not over-clamped or released mid-cycle.
Fed from the plant ring main at a packaging line, the unit drops the header pressure to the low level the sealer's cylinders need, while the 5 um element and drain bowl keep moisture and pipe scale out of the machine's directional valves.
On a distribution conveyor, the short-stroke pusher cylinders run at a deliberately low set pressure so delicate parcels are diverted, not crushed; this unit filters the air feeding the gate solenoids and regulates that low pressure at the line side.
Start with the size and port: this unit is size 300 with a PT1/4 port; step up to 400 or 600 when the circuit needs a larger port and more flow, or down to 200 for compact point-of-use drops. This example carries the 5 um element (code W); the 40 um standard element suits general plant air, while 5 um suits finer downstream components. The drain here is the differential-pressure type, which bleeds the bowl when the pressure differential rises; automatic (A) and manual (M) drains are also available. The gauge fitted here is the external round type reading in psi; the embedded square gauge is standard, with MPa, psi or bar scales to choose from. The thread is PT as standard, with G and NPT as order options, and the J code means no mounting bracket is supplied. This is the low-pressure regulator type; if your set pressure sits in the standard band, order the plain GFR300 instead. Because flow is published as curves and not a single rating, ask us to confirm sizing against your application before ordering.
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 GFR series as curves, not as a single rated figure, so we do not quote one number here. Send us your inlet pressure, set pressure and the flow your circuit needs, and we will confirm from the datasheet curves whether this size-300, PT1/4 unit is correctly sized before you order.
The W code on this model specifies the 5 um element, which suits finer downstream components such as precision valves, grippers and instrumentation. The standard element is 40 um, which is the usual choice for general plant air feeding cylinders and air tools. Both grades are available across the GFR sizes, so you can match the grade to the most sensitive component on each drop.
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.