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 AirTAC GFR400-10 is a filter regulator: it removes water and particulate from compressed air and holds downstream pressure at a set point in one body. This configuration is built on the size 400 frame with 3/8 in NPT ports, a 5 um filter element (code W), a manual-drain polycarbonate bowl, and the low-pressure regulator type for circuits that run below standard line pressure. It comes with a round MPa pressure gauge fitted and a reverse/check valve (code K) that blocks back-flow through the unit; no mounting bracket is included (code J). Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um (W) filtration, standard or low-pressure regulation, embedded square or external round gauges on MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application on request.
| 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 | Fitted — round, MPa 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". |
| 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. C is round, F is square. |
| 1 | Gauge scale: MPa. 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) |
Fixture clamps that hold workpieces during machining often run at a set pressure well below the main line. This unit filters the supply to 5 um to protect the directional valves, regulates it down with the low-pressure type, and the check valve blocks back-flow through the unit if the upstream supply dips.
Analytical instruments and sample-handling pneumatics need clean, steady air at a modest set pressure. The 5 um element strips water and particulate before the regulator, the manual drain lets the technician bleed accumulated condensate at the start of a shift, and the MPa gauge gives a clear local reading.
Packaging lines run many small cylinders for diverting, pushing and indexing. This unit gives the line a filtered, regulated supply at 3/8 in, and the fitted reverse/check valve keeps the downstream circuit isolated from back-flow when the main header is shut off for changeover or maintenance.
Choose the size by the air demand of your line: the 200, 300, 400 and 600 frames step up in port and capacity, and this size 400 unit carries 3/8 in NPT ports. Because AirTAC publishes flow as characteristic curves rather than a single rated figure, send us your supply pressure, set pressure and consumption and we will confirm the fit from the datasheet before you order. Pick the drain to match your maintenance routine: manual (this unit, code M) is opened by hand, automatic drains condensate continuously, and the differential-pressure default drains on a set pressure drop. Filtration here is 5 um (code W) against the 40 um standard element - choose 5 um where downstream valves and instruments are finer-tolerance. The low-pressure regulator type (code L) suits circuits set well below standard line pressure; its exact adjustment range is not published, so confirm it with us. The gauge is the optional external round type on an MPa scale; the embedded square gauge and psi or bar scales are alternatives. Thread is NPT here; PT is the standard and G (BSPP) is also orderable. No mounting bracket is included, so add one if panel or wall fixing is needed.
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 GFR series as characteristic curves, not as a single rated figure, so we do not quote a number on the page. Send us your supply pressure, target set pressure and air consumption, and we will confirm the sizing against the datasheet curves on request before you order.
The code M in GFR40010MLJC1WTK specifies a manual drain: the bowl is emptied by hand as part of routine maintenance, which suits lines with supervised duty or infrequent condensate build-up. AirTAC also offers automatic and differential-pressure drains on the same frame, so if your application runs unattended, tell us and we will identify 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.