The AirTAC GFR400-10N AirTAC Filter Regulator, NPT 3/8 in 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 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 AirTAC GFR400-10N combines water and particulate filtration with pressure regulation in a single body, sized for 3/8 in NPT ports. This configuration uses the standard 40 um filter element and a differential-pressure drain, which bleeds accumulated condensate automatically whenever the pressure differential across the element rises - no daily manual draining on lines that run steadily. A reverse (check) valve is fitted, and the unit ships with a mounting bracket. Note that no gauge is fitted in this code; a gauge can be specified separately if you want a visual setpoint reference.
This is a genuine AirTAC part from the GFR400 series, one of four sizes (200/300/400/600) spanning the port range from 1/8 in to 1 in, with optional 5 um filtration (code W), manual or automatic drain variants, and G or NPT thread options to order. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application.
| Model | GFR400-10N AirTAC Filter Regulator, NPT 3/8 in |
|---|---|
| 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 | Standard 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 | 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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". |
| (blank) | Drain: Differential-pressure drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| 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 | GFR400 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Mounted at the drop to a CNC machining centre, the unit cleans condensed water and swarf-laden particulate from the shop air and holds a steady regulated pressure to the machine's pneumatic valves and clamps. The check valve helps hold the downstream circuit if supply pressure dips.
On a carton-forming and sealing line, the filter-regulator conditions the air feeding cylinders and vacuum generators that run all shift. The differential-pressure drain keeps condensate off the moving parts without an operator opening a drain valve each morning.
At the inlet to a paint booth's air supply, the 40 um element removes water and pipe scale before the regulated feed reaches spray equipment and air motors, protecting finish quality. The check valve prevents backflow through the conditioning point when the compressor unloads.
Start with the port and size step: the 400 size carries a 3/8 in port, one step above the 300 and one below the 600, so match it to your line size and the flow curve rather than to a single rating. Choose the drain to suit duty: differential-pressure (this unit) suits continuous running, automatic (code A) drains on a timer-like cycle, and manual (code M) suits intermittent lines where someone is on site anyway. Filtration is 40 um standard; specify 5 um (code W) only where downstream components genuinely need finer air. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also available to order. A bracket is included with this code; a gauge is not, so add one if operators need to verify setpoints.
Because flow is published as curves and not as a single rated number, 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 GFR400 series as curves, not as a single rated figure, so we do not quote a number here. Tell us your line pressure and the air demand of the equipment you are feeding, and we will confirm the sizing against the datasheet on request before you order.
The N in GFR400-10N means no pressure gauge is fitted, so you would read setpoints with a separate gauge if needed; gauge options can be ordered for the family. The K means a reverse (check) valve is built in, which blocks backflow through the unit when upstream pressure falls away.
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.