The AirTAC GFR30008ALJNT 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 AirTAC GFR30008ALJNT is a size-300 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body, so you install one unit instead of a separate filter and regulator. This configuration is fitted with a 1/4 in NPT port, a 40 um standard filter element, and an automatic drain that ejects collected condensate without anyone opening the bowl - useful where the unit sits in an awkward spot or on a line that runs unattended. It is the low-pressure type (code L), has no gauge fitted, no mounting bracket, and no reverse/check valve. The polycarbonate bowl suits the 300 size, and the unit handles a maximum inlet pressure of 1.0 MPa (145 psi) at 5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port options from 1/8 in to 1 in, a choice of automatic, manual or differential-pressure drains, a 5 um element option, gauge variants, and G (BSPP) or NPT threads in place of the PT standard. Flow is published in the catalogue as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR30008ALJNT 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 | 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". |
| 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. |
| (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 bench-top assembly fixture that clamps workpieces with low-pressure air cylinders, this filter regulator cleans the supply of water and swarf and holds the reduced pressure the clamps were set up for, with the automatic drain keeping the bowl clear between shifts.
Feeding the low-pressure pneumatic actuators on a carton-sealing or labelling conveyor, the unit strips condensate and 40 um particulate before the valves and regulates the supply in one compact body, and the auto drain suits a line that runs without an operator at the prep station.
Where a lab rig or pilot-plant skid needs cleaned, low-pressure air for pneumatic controls or sample handling, the 1/4 in NPT connection drops straight into bench pipework, the 40 um element protects the downstream devices, and the low-pressure type matches circuits that never see full line pressure.
Start with the port step: this unit is a size-300 body with a 1/4 in NPT thread, which suits 1/4 in air lines; if your flow demand sits above what a 300-size body carries, step up to the 400 or 600 size rather than oversizing the regulator setting. The automatic drain here means condensate is expelled on its own - choose the manual-drain variant only if you prefer a controlled, operator-emptied bowl, or the differential-pressure drain if you want discharge tied to the pressure drop across the element. The 40 um element is the standard grade; specify the W code if your downstream equipment needs the 5 um option. This is the low-pressure type, so confirm the adjustment range suits your circuit before ordering. No gauge is fitted on this code - gauge variants with MPa, psi or bar scales exist if you want a visual reference. Thread is NPT here; G (BSPP) and the PT standard are the other order options, and the bracket has been omitted (J) where a bracket is otherwise available.
One honest note on sizing: AirTAC publishes flow for this family as curves, not as a single rated number, so we do not quote a flow figure here. Send us your application details and we will confirm the sizing against the datasheet curves 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 GFR family as curves rather than a single rated figure, so we do not quote a rated flow number for this unit. Send us your line pressure, downstream demand and port arrangement, and we will confirm the relevant datasheet figures on request so you can size the 300-size body against your application before ordering.
The automatic drain (code A) expels collected condensate from the polycarbonate bowl by itself, so the unit does not need periodic manual draining - a good fit for unattended or hard-to-reach positions. This code also omits the gauge (N) and the mounting bracket (J); gauge variants with MPa, psi or bar scales and the bracket are available as separate order options if you want them fitted.
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.