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 regulates downstream pressure in a single body. This unit is the size-400 model with 3/8 in NPT ports, a 5 um filter element (the finer W grade), a manual drain bowl in polycarbonate, and the low-pressure regulator type. It is supplied without a gauge, without a mounting bracket and without a reverse/check valve, so plan your panel accordingly.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of 40 um or 5 um filtration, manual, automatic or differential-pressure drains, gauge options and PT, G or NPT threads. Flow figures for the series are published as curves rather than a single rating, so ask us and we will confirm the datasheet numbers for your application before you order.
| 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. |
| 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) |
A spray booth or coating line needs clean, finely filtered air held at a gentle, stable pressure for the atomising circuit. The 5 um element protects the finish from particulate, and the low-pressure regulator type suits circuits that run well below standard line pressure.
Clamping and holding circuits on assembly presses often need a soft, low setpoint rather than full line pressure. This filter regulator cleans the supply and holds the reduced setting on the clamp cylinders, with the manual drain emptied during scheduled checks.
On a cartoning or wrapping line, the air feeding small actuators and sealing cylinders is filtered to 5 um and regulated to the pressure the machine was set up with. The 3/8 in NPT ports drop straight into the machine's existing supply plumbing.
Size up by port and flow: the GFR400 step gives 3/8 in ports, and the series steps through sizes 200 to 600 as your flow demand grows. This unit carries the 5 um W-grade element - choose it where finer particulate removal matters; the 40 um standard grade suits general air prep. The manual drain bowl means an operator opens the drain periodically to expel collected water; automatic or differential-pressure drains are available elsewhere in the series if you prefer unattended drainage. Thread is NPT here, with PT (standard) and G also orderable, and brackets and gauges can be added if your panel needs them.
One honest note on sizing: AirTAC publishes flow for this series as curves, not a single rated figure, so send us your application details and we will confirm the right size against the curves 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 performance curves rather than a single rated figure, so we do not quote one number. Tell us your application and we will confirm the relevant datasheet curve and sizing for you on request before you order.
The M in the code means the bowl drain is operated by hand: an operator periodically opens it to release collected water, unlike the automatic or differential-pressure drain options in the series. The W in the code is the 5 um filter element, the finer of the two grades (the standard is 40 um), chosen where downstream equipment needs cleaner air.
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.