The AirTAC GFR300-08ALJNTK 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 automatic 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 GFR300-08ALJNTK is an AirTAC GFR300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration has a 1/4 in NPT port, an automatic drain that ejects collected condensate without manual attention, a 40 um standard filter element, the low-pressure regulator type, and an integrated reverse (check) valve. No gauge is fitted and no mounting bracket is included. It is rated for a maximum inlet pressure of 1.0 MPa (145 psi), operates from -5 to 70 C (non-freezing), and carries a polycarbonate bowl.
This is a genuine AirTAC part. The GFR series spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, PT, G and NPT thread options, differential-pressure, automatic or manual drains, a 5 um (W) element option, gauge choices and bracket variants. Flow is published as curves rather than a single rating, so ask us to confirm the figures for your application.
| Model | GFR300-08ALJNTK 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Not fitted |
| 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". |
| A | Drain: Automatic 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. |
| N | No pressure gauge (N). |
| (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. |
| 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) |
Feeding cleaned, regulated air to clamping cylinders on a machining fixture: the low-pressure regulator type serves circuits set below standard ranges, and the check valve blocks reverse flow between cycles.
Conditioning the supply to a carton-sealing or wrapping machine's pneumatic actuators: the 40 um element and automatic drain keep water and debris out of directional valves while regulation holds actuator settings steady.
Supplying filtered, regulated air to spray guns in a paint finishing booth, where the automatic drain clears condensate on its own and the low-pressure type fits circuits run at lower setpoints.
Size and port set the air capacity: this unit is size 300 with a 1/4 in NPT port; step up to 400 or 600 for larger circuits, or down to 200 for compact ones. Drain type matters: automatic (this unit) handles condensate on its own, manual needs operator action, and the default differential-pressure drain works off line pressure drop. The filter element is 40 um standard; specify code W for the 5 um grade. Round or square gauges with MPa, psi or bar scales, a reverse/check valve, a mounting bracket, and PT or G threads instead of NPT are all orderable variants. Flow is published as curves, not a single rating, so send us your application details 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as curves rather than a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the flow and sizing from the datasheet before you order.
A is the automatic drain, L is the low-pressure regulator type, J means no mounting bracket, N means no gauge is fitted, T is the NPT thread option, and K means a reverse (check) valve is fitted. The 300 is the size and 08 is the 1/4 in port.
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.