The AirTAC GFR300C08LJF2W AirTAC Filter Regulator 1/4 in PT, 5 um 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 AirTAC GFR300C08LJF2W is a GFR-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This 300-size unit is fitted with a 1/4 in PT port, a 5 um filtration element (the finer of the two catalogue grades), a differential-pressure drain that bleeds collected condensate automatically when the pressure differential across the element rises, and an embedded square gauge reading in psi. It is the low-pressure type, built for circuits regulated well below standard line pressure, and it is supplied without a mounting bracket.
This is a genuine AirTAC part. The GFR filter-regulator family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of drain types, 40 um or 5 um filtration, standard or low-pressure regulation, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR300C08LJF2W AirTAC Filter Regulator 1/4 in PT, 5 um |
|---|---|
| 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 an assembly fixture where clamping cylinders must be held at a deliberately reduced working pressure, this filter regulator cleans the supply and holds the setpoint, with the psi gauge giving the operator a direct reading at the station.
Bench rigs, test stands and analytical equipment that cannot tolerate water or fine debris in the air line use the 5 um element ahead of sensitive instruments, while the regulator sets the gentle pressure such gear needs.
Feeding positioners and pilot-operated process valves on a plant line, where clean, finely filtered air at a stable reduced pressure protects the pilot stages and keeps the valve train responding consistently.
Size and port set the air capacity: this 300-size unit takes a 1/4 in PT connection, one step up from 200-size, so step up to 400 or 600 if your line needs more flow. The 5 um element (code W) suits instruments, valves and coating work that need finer air than the standard 40 um grade; note that finer filtration raises the differential-pressure drain's duty. The low-pressure type is the right pick when the working pressure sits well below standard regulator range - we will confirm the exact adjustment span from the datasheet on request. Thread is PT as standard; G (BSPP) and NPT are order options. A mounting bracket is not included with this code but is available, and the square gauge can be swapped for an external round gauge in MPa, psi or bar scale.
Flow for this family is published as curves, not a single rated figure, 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. 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 GFR300 series as performance curves rather than a single rated number, so there is no one figure we can honestly quote. Tell us your line pressure and the flow your application needs, and we will confirm the sizing against the datasheet curves before you order.
The W in the code GFR300C08LJF2W selects the optional 5 um filtration grade, the finer of the two catalogue grades, instead of the 40 um standard element. Choose 5 um when downstream valves, instruments or coating work need cleaner air; the differential-pressure drain on this unit automatically vents collected condensate as the element loads up.
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.