The AirTAC GFR30008LJF3TK AirTAC Filter Regulator NPT1/4 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 GFR30008LJF3TK is an AirTAC GFR300 filter regulator: a 1/4 in (NPT1/4) unit that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the low-pressure regulator type, fitted with a 40 um standard filter element, a differential-pressure drain, an embedded square gauge scaled in bar, and a reverse (check) valve. The bowl on this 300 size is polycarbonate (PC), the unit is ordered without a mounting bracket, maximum inlet pressure is 1.0 MPa (145 psi), and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR line spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options include manual or automatic drains, a finer 5 um (W) element, MPa/psi/bar gauge scales, an external round gauge, G or NPT threads and optional brackets. Flow performance 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 | GFR30008LJF3TK AirTAC Filter Regulator NPT1/4 Low-Pressure |
|---|---|
| Series | GFR300 filter regulator |
| Port size | PT1/4" (NPT 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, 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 1 is MPa, 2 is psi, 3 is bar. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR200 |
| One size up | GFR400 |
| Add lubrication | GFC300-08 (two-unit set) |
On an assembly fixture where clamps must close at a reduced, stable pressure, this filter regulator cleans the supply and trims it down ahead of the clamp cylinders, with the fitted check valve in the circuit and the square bar gauge giving the setter a direct reading.
Feeding pilot stages and positioners of process valves, where the 40 um element keeps particulate out of small orifices and the low-pressure regulator type holds the pilot supply well below header pressure, monitored on the built-in gauge.
On a packaging line's small-bore cylinders, this 1/4 in unit pairs water and particle removal with a reduced working pressure, while the differential-pressure drain clears collected condensate from the PC bowl as the element loads.
Every choice on this line is decodable from the code. Step through sizes 200/300/400/600 and ports 1/8 to 1 in to match the air demand of the circuit - this 300 size with 1/4 in NPT ports suits compact machine supply. Choose the drain: differential-pressure (this model), automatic (A) for unattended condensate removal, or manual (M) for periodic draining. Choose the element: 40 um standard or 5 um (W) where finer particulate protection matters. Gauges are embedded square as standard with MPa, psi or bar scales, or an external round gauge; threads come as PT (standard), G or NPT; brackets are optional. Because flow is published as curves rather than a single rated figure, send us your flow and pressure requirements and we will confirm the right size 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 GFR performance as flow curves rather than a single rated figure, so we do not quote a number here. Send us your flow, inlet pressure and required set pressure and we will confirm from the datasheet whether the GFR300 with 1/4 in NPT ports is correctly sized for your circuit before you order.
The L in the code marks the low-pressure regulator type, intended where the working pressure must sit well below a standard regulator's setting. AirTAC does not publish a separate adjustment figure for this variant, so we confirm the exact range from the datasheet on request. Everything else decodes as standard: 40 um element, differential-pressure drain, square gauge scaled in bar, check valve fitted, no bracket.
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.