The AirTAC GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, 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 manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The GFR400-10 is an AirTAC GFR400-series filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the size 400 unit with a 3/8 in NPT port, the fine 5 um filter element (code W), a manual drain on the bowl, and the low-pressure regulator type. No gauge is fitted (code N), so downstream pressure must be read with a separate gauge if required, and the mounting bracket is included.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drain, 40 um standard or 5 um fine filtration, and G (BSPP) or NPT threads as order options alongside the PT standard. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 130 psi)). |
| L | Low-pressure 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. |
| 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 a fixture-clamping manifold that holds workpieces at reduced pressure, this filter regulator cleans the supply to 5 um and holds the clamping setpoint, with the manual drain bled at shift start.
Feeding actuators and small air-driven tools on a laboratory or test-bench setup, the 5 um element protects sensitive components while the low-pressure type regulates the reduced working pressure.
On a CNC machining centre's purge and air-blast circuit, this unit strips water and fine particles from the shop air and sets the lower pressure the purge nozzles need, with the included bracket mounting it at the machine.
Start with the port step: this unit is size 400 with a 3/8 in NPT port; step up to the 600 size if your line needs more flow capacity, or down to 300/200 for compact circuits. Filtration is 5 um here (code W) instead of the 40 um standard element - choose 5 um where downstream valves, cylinders or instruments are sensitive to fine particles. Drain is manual (code M): someone must bleed the bowl periodically, so pick automatic or differential-pressure drain instead on unmanned lines. The low-pressure regulator type (code L) suits circuits set well below standard working pressure; the exact adjustment range for the low-pressure type is not published, so confirm it with us. No gauge is fitted; a gauge is available on other configurations. PT is the standard thread, with G (BSPP) and NPT as catalogue options - this unit is ordered in NPT. A mounting bracket is included.
Flow for this series is published as curves, not a single rated number, so we do not quote a rated flow figure. 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. 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 figure, so we do not quote a rated flow, Cv or SCFM number. Send us your application details and we will confirm the datasheet flow curves and sizing for the 3/8 in size 400 unit before you order.
The M in the code means the bowl is drained by hand: open the drain periodically to release collected water, which suits attended lines but not unmanned ones - automatic or differential-pressure drain is available on other configurations. The N code means no gauge is fitted; this unit has no pressure gauge, so use a separate gauge to read the regulated pressure. The low-pressure regulator type's exact adjustment range is not published, so confirm it with us.
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.