The AirTAC GFR400-10ALJNT AirTAC Filter Regulator NPT3/8, Auto Drain 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 PT3/8" 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 GFR400-10ALJNT is a size-400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration carries a 3/8 in NPT port, an automatic drain that expels collected condensate without manual attention, and the standard 40 um filtration element. It is the low-pressure type and is supplied without a gauge and without a mounting bracket.
This is a genuine AirTAC part from the GFR range, which spans sizes 200 to 600 with port options from 1/8 in to 1 in, a choice of automatic, manual or differential-pressure drains, an optional 5 um element (code W), and G or NPT thread variants. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR400-10ALJNT AirTAC Filter Regulator NPT3/8, Auto Drain |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (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.
| GFR400 | G-series filter regulator, 400 body — sets the port range. |
|---|---|
| 10 | Port size PT3/8". This body offers 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 | GFR400 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Feeds air cylinders and pneumatic valves on machines that run at reduced supply pressure, where the low-pressure regulator type is specified and the automatic drain keeps condensate out of the actuation line.
Supplies filtered, regulated air to clamping and fixture circuits on machining centres, with the 40 um element protecting directional valves and the automatic drain handling condensate between shifts.
Conditions the air feeding wrapper and cartoner actuators on packaging lines, combining water and particulate removal with pressure regulation in one body to save panel space on a 3/8 in drop.
Start with the port step: this size-400 unit takes a 3/8 in connection, and the GFR range steps through 1/8, 1/4, 3/8, 1/2, 3/4 and 1 in, so match the size to the air demand of the circuit rather than oversizing on impulse. Drain choice matters in practice: automatic drain suits unattended or hard-to-reach installations, manual drain suits supervised points, and the differential-pressure default suits standard duty; this unit is the automatic-drain version. Filtration is the standard 40 um element; choose the 5 um W variant if downstream equipment needs finer air. This is the low-pressure type, so confirm its regulation range against your setpoint before ordering. Thread is NPT here; PT is the standard catalogue thread and G (BSPP) is also available to order. Brackets are optional on this configuration. Because flow is published as curves and not a single rating, ask us to confirm sizing against your application 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 this series as curves, not as a single rated figure, so we do not quote a number. Send us your application details and we will confirm the flow and datasheet figures for this exact configuration on request.
The automatic drain expels collected condensate from the bowl on its own, so the unit suits installations that are not checked daily; manual and differential-pressure drains are the other catalogue options. This configuration carries no gauge (code N), and the low-pressure regulator type means its exact regulation range should be confirmed with us before ordering.
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.