The AirTAC GFR30008LJF2G 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 series combines water and particulate filtration with pressure regulation in a single body, so one G1/4 (1/4 in) connection handles both jobs in a compressed-air line. This configuration, GFR30008LJF2G, is the low-pressure type with a 40 um standard filter element, a differential-pressure drain that bleeds collected condensate automatically as flow passes through, an embedded square gauge reading in psi, and no mounting bracket. The polycarbonate bowl lets you see the condensate level at a glance, 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 is published in sizes 200, 300, 400 and 600, with port sizes from 1/8 in to 1 in, manual or automatic drain options, a 5 um (code W) filter grade, square or round gauges with MPa, psi or bar scales, and G or NPT thread variants alongside the PT standard. Because flow is published as curves rather than a single rating, we confirm the datasheet and sizing figures for your application on request.
| Model | GFR30008LJF2G 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 — square, psi 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. 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). |
| F | Gauge shape: Square. 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. |
| (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 · PT1/4" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On a machining or assembly cell where low-pressure air holds workpieces in soft-jaw fixtures, this filter regulator cleans the supply of water and grit and holds a steady low set pressure, with the psi square gauge giving the operator a direct reading at the cell.
Filling, sealing and labelling machines on a packaging line run short-stroke cylinders and air jets that are sensitive to dirt and pressure drift; a G1/4 filter regulator mounted at the machine inlet keeps the supply filtered and regulated, and the differential-pressure drain handles condensate without a daily manual blow-down.
Bench-top test rigs and laboratory automation that pulse small actuators or air bearings need clean, low-pressure air; the low-pressure type regulation, 40 um filtration and visible polycarbonate bowl make this unit a tidy single-connection supply point, with the psi gauge matching US bench instruments.
Start with the port step: this unit is size 300 with a G1/4 port, and the 200/300/400/600 ladder exists so you can move up a size when your line needs more flow rather than over-throttling a small unit. The 40 um element on this model is the standard grade for general plant air; if the downstream equipment needs finer protection, the same family is available with a 5 um element (code W). Drain choice matters: this model uses the differential-pressure drain, which discharges automatically in service, while manual-drain and fully automatic-drain variants are orderable. The fitted square gauge here reads in psi; MPa and bar scales are alternatives, and an external round gauge is optional.
Thread is the other decodable choice: PT is the catalogue standard, with G (BSPP) as on this model and NPT available as order options, so match the thread to your piping. This unit ships without a mounting bracket; bracketed versions exist in the family. Note that this is the low-pressure (L) type, whose regulation range is not published in the same table as the standard type - ask us to confirm the range against your set pressure. Because flow is published as curves rather than a single rated figure, send us your application details and we will confirm sizing from 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 curves, not as a single rated number, so we do not quote a l/min, m3/h or SCFM figure. Send us your application - port size, downstream consumption and set pressure - and we will confirm the sizing from the datasheet on request.
The L in the code marks this as the low-pressure regulator type rather than the standard type; it is intended for applications where the set pressure sits below the standard type's normal working band. The exact regulation range for the low-pressure type is not published in the standard table, so ask us to confirm the range against your set pressure before ordering. The fitted square gauge reads in psi; MPa and bar scales are available as alternatives.
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.