The AirTAC GFR400-10 AirTAC Low-Pressure Filter Regulator 3/8 NPT is a genuine G-series filter regulator: water separation, 5 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 GFR400-10 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 400-size unit is fitted with a 3/8 in NPT port, a 5 um filter element (the finer of the two catalogue grades), an automatic drain that ejects collected condensate without manual attention, and the low-pressure regulator type. No pressure gauge is fitted and no mounting bracket is included, so plan a panel or machine mounting point and add a gauge separately if you want a local pressure readout.
This is a genuine AirTAC part from the GFR series, which spans the 200, 300, 400 and 600 sizes with port options, manual or automatic drains, 40 um or 5 um elements, gauge choices and PT, G or NPT threads. AirTAC publishes flow for this series as curves rather than a single rated figure, so send us your application details and we will confirm the sizing and datasheet figures before you order.
| Model | GFR400-10 AirTAC Low-Pressure Filter Regulator 3/8 NPT |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 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. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
On an assembly robot cell with vacuum or gripper actuation, this unit filters the plant air to 5 um and holds a steady low regulated pressure to the gripper circuit, with the automatic drain keeping condensate out of the valve manifold.
Feeding the pneumatic cylinders of a carton sealing or taping machine, the GFR400-10 cleans the incoming air and regulates it at the low setting the sealer was set up for, while the automatic drain handles moisture from a long compressed-air run.
For workholding clamps on a CNC machining centre, this unit supplies filtered air and a stable low regulated pressure to the clamp circuit, protecting the clamping valves from water and particulate carryover.
Start with the port step: the 400 size in 3/8 in NPT suits lines running larger-bore air mains than the 200/300 sizes, but the right size depends on the flow your circuit needs, so let us check the catalogue curve against your demand before ordering. This unit pairs the automatic drain (no day-to-day draining duty) with the 5 um element - choose 5 um where downstream valves and cylinders want finer filtration, or the 40 um standard grade where coarser protection is enough. The low-pressure regulator type is intended for circuits that hold lower working pressure than the standard type; ask us to confirm the exact adjustment range for your setpoint. No gauge is fitted on this code, so add a separately ordered gauge if you need a local indication, and note that no mounting bracket is included. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also orderable.
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 series as curves, not as a single rated number, so we do not quote a l/min or SCFM figure. Send us your application flow and pressure requirements and we will confirm the sizing from the datasheet before you order.
The A in the code GFR40010ALJNWT selects the automatic drain, which ejects collected condensate on its own instead of relying on manual draining, and the W selects the 5 um element instead of the 40 um standard grade. If you would rather drain manually or filter less finely, those variants exist in the same GFR400 series - ask us for the matching code.
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.