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 differential-pressure 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 holds downstream pressure at your set point in one body. This size 400 unit is specified with a 3/8 in NPT port, the 5 um (W) filter element instead of the 40 um standard, the low-pressure regulator type, a differential-pressure drain that bleeds collected condensate automatically as flow passes through, and a check (reverse) valve that holds downstream pressure if the supply is interrupted. It ships as configured with a round external gauge scaled in psi and a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. The polycarbonate bowl suits the 400 frame (only size 600 uses an aluminium alloy bowl).
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, differential-pressure, automatic or manual drains, standard or low-pressure regulation, gauge and scale options, G/NPT thread variants and bracket choices. Because AirTAC publishes flow only as curves rather than a single rated figure, we confirm the exact flow 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 | 0.15 - 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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". |
| (blank) | Drain: Differential-pressure 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. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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) |
Point-of-use conditioning for the air feeding a machining centre's tool-changer and clamping circuits: the 5 um element protects fine valve internals from particulate, while the low-pressure regulator holds a gentle set point for sensitive actuation and the check valve keeps clamps from venting if the shop supply drops.
Clean, steady air for lab benches, environmental chambers and test rigs where instruments and pneumatic controls need finely regulated low pressures. The psi-scaled round gauge gives operators a direct readout, and the differential-pressure drain keeps condensate moving out without daily attention.
Conditioning the air branch that runs low-pressure actuators and delicate gripper cylinders on a packaging or bottling line. The filter-regulator in one body saves panel space, the 5 um grade suits the sensitive valve islands downstream, and the included bracket simplifies mounting beside the machine.
Size 400 with a 3/8 in NPT port is the right step when your line's required flow sits above what a 300-frame unit comfortably serves; step up or down through 200/300/400/600 to match the port and curve. The 5 um element here suits air that feeds sensitive components; choose the 40 um standard grade for general upstream protection. The low-pressure regulator type is intended for set points below the standard type's range - the exact range for the low-pressure type is not published, so confirm your set point with us before ordering. The differential-pressure drain needs no timer or operator, but an automatic or manual drain can be specified instead. The round psi gauge is fitted as coded; embedded square gauges and MPa or bar scales are the other options. NPT is the thread on this code; PT is the catalogue standard and G (BSPP) can be ordered. A bracket is included, and the K code confirms the check valve is fitted.
One honest routing note: AirTAC publishes flow as curves, not a single rated number, so ask us to confirm sizing against your application's flow demand 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 GFR series as performance curves rather than a single rated figure, so there is no one rated flow number we can quote for this 3/8 in, size 400 unit. Tell us your application's flow demand and set point and we will confirm the sizing against the datasheet curves on request before you order.
With no drain code in the model, the GFR400-10 carries the differential-pressure drain as the default: condensate collected in the polycarbonate bowl is bled off automatically as air flows through, with no timer or manual intervention. If your duty cycle leaves long idle periods, the automatic (A) or manual (M) drain variants can be ordered instead - just ask us to quote the alternative 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.