The AirTAC GFR400-10 AirTAC Filter Regulator 3/8 in NPT, 5 um 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: it removes water and particulate from compressed air and regulates downstream pressure in a single body, so one 3/8 in NPT unit does both jobs in the air-preparation line. This configuration is the low-pressure (L) type for circuits that run below standard line pressures, with a 5 um (code W) filter element for finer particle capture than the standard 40 um grade. The automatic drain (code A) discharges collected condensate without anyone opening the drain, the embedded square gauge is fitted and reads in psi, and a reverse/check valve (code K) is fitted. No mounting bracket is included (code J). The polycarbonate bowl suits non-freezing installations from -5 to 70 C, and the maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part in the GFR400 size class. GFR filter regulators span the 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, standard or low-pressure regulation, square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator 3/8 in NPT, 5 um |
|---|---|
| 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 | Fitted — square, psi scale |
| 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.
| 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. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 2 | Gauge scale: psi. 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. |
| 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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
A CNC machining cell running air clamps and workholding at reduced line pressure gets filtration and regulation from one 3/8 in NPT unit; the 5 um element protects the clamp valves, and the psi gauge lets the setter verify set pressure at a glance.
On a packaging conveyor with cylinders, diverters and small actuators fed at 3/8 in, this filter regulator cleans the air and holds a steady low set pressure; the automatic drain clears condensate on a line that runs unattended across shifts.
A lab test bench or pilot rig needing clean, low-pressure air for instruments and pneumatic controls uses the 5 um filtration and low-pressure regulation type; the check valve holds the set circuit if upstream supply dips, and the psi gauge documents the test condition.
Start with the port step: this unit is the 400 size with a 3/8 in NPT port; step up to 500/600-class ports for larger demand or down to 200/300 for lighter lines, matching the size to the flow your circuit needs. Drain choice matters in unattended plant: automatic drain (this unit) suits points without regular manual checks, manual drain suits attended stations, and differential-pressure drain is the default elsewhere. The 5 um element (W) is the finer option where downstream valves and instruments need cleaner air than the standard 40 um grade. The fitted square gauge reads in psi; MPa or bar scales and an external round gauge are alternatives. Thread is NPT here, with PT as the standard and G also available to order; the J code means no mounting bracket, so plan your own panel or bracket fixing.
One honest note on sizing: AirTAC publishes flow as curves, not a single rated number, and the exact regulation range of the low-pressure type is not stated in the material we hold. Tell us your line pressure and air demand and we will confirm the datasheet figures and the fit against your application 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 that is not in the datasheet. Send us your line pressure and the air consumption of the equipment you are feeding, and we will confirm the flow-curve figures and check the fit for your application before you order.
The L in the code marks the low-pressure regulator variant, intended for circuits that run below standard line pressures; the exact regulation range for this type is not published in our material, so we confirm it on request. The A code is the automatic drain: condensate collected in the polycarbonate bowl is discharged on its own, so the unit does not depend on someone opening a manual drain.
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.