The AirTAC AirTAC GFR400-10 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 size 400 unit has a 3/8 in NPT port, a manual-drain bowl in polycarbonate, a 5 um filter element (the finer of the two grades), and a round pressure gauge scaled in MPa. It is the low-pressure type and is supplied without a mounting bracket.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, drain choices (differential-pressure, automatic or manual), 40 um or 5 um filtration, and gauge and thread options. Max inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Because flow is published as curves rather than a single rating, we confirm the datasheet figures for your application on request.
| Model | AirTAC GFR400-10 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 | 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. |
| (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. |
| (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) |
Air preparation for low-pressure clamping fixtures on a machining centre: the 5 um element helps keep water and swarf out of the directional valves while the low-pressure regulator holds a gentle, steady setting to the clamps.
Point-of-use supply for packaging machinery, where the manual drain lets operators bleed the bowl at shift checks and the 5 um grade helps keep pick-and-place cylinders and actuators running clean.
Low-pressure air supply for spray guns and coating lines, where fine 5 um filtration supports finish quality and the low-pressure regulator type is suited to gentle controlled settings.
Match the size and port to the air demand of the line: this unit is size 400 with a 3/8 in NPT port, and larger sizes carry larger ports and more flow. The 5 um element (code W) suits points of use needing finer filtration than the 40 um standard. The manual drain means an operator opens the bowl drain during routine checks; automatic and differential-pressure drains are the hands-off alternatives. The fitted round gauge reads in MPa, with embedded square gauges and psi or bar scales available. Thread here is NPT; PT is the standard and G (BSPP) is an order option. The low-pressure regulator type is selected where controlled pressures sit below the standard range; its exact adjustment range is not published, so ask us to confirm it. Flow is published as curves, not a single rating - ask us to confirm sizing against your application before ordering.
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 rather than a single rated figure, so we do not quote a number here. Tell us your line pressure and air demand and we will confirm the sizing from the datasheet on request.
This unit has a manual drain: an operator opens the bowl drain during routine checks. If you prefer not to rely on manual attention, the same GFR400 size is available with an automatic or differential-pressure drain - ask us for that variant.
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.