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 sets downstream pressure in a single body, so one component does both jobs on the air line. This configuration is the size 400 unit with a 3/8 in NPT port, a manual drain bowl in polycarbonate, a fine 5 um filter element, an embedded square gauge scaled in bar, and a built-in reverse/check valve that holds the set pressure if upstream supply drops. The standard regulator covers an adjustment range of 0.05-0.9 MPa (7-130 psi) with this manual-drain version, and maximum inlet pressure is 1.0 MPa (145 psi). Operating temperature is -5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR400 series. The GFR line spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and options include automatic or differential-pressure drains, a 40 um standard element in place of the 5 um one, MPa, psi or bar gauge scales, G (BSPP) or NPT threads in place of the PT standard, and bracket variations. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing 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 | Standard 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 — square, bar 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. Standard type, regulating 0.05 - 0.9 MPa (7 - 130 psi). 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)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 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) |
Feeds clean, regulated air to the tool-clamp and pallet-clamp circuits on a machining centre, with the 5 um element protecting tight-tolerance valves from particulate and the check valve holding clamp pressure through supply dips.
Sits at the head of the air drop feeding cylinder-driven case packers and sealing heads, filtering condensed water out of the shop air and holding a steady set pressure so carton handling stays repeatable shift after shift.
Conditions the supply to benchtop analytical and test instruments that need dry, particle-free air at a fixed setting, with the bar-scaled square gauge giving a clear local reading and the manual drain allowing controlled bowl servicing.
Step up or down through the GFR sizes (200/300/400/600) and their matching ports (1/8 in to 1 in) to suit the flow your line needs - the 400 size with its 3/8 in port sits in the middle of the range. Drain choice matters: manual drain means someone bleeds the bowl on a routine, differential-pressure drain bleeds only when the pressure drop across the element calls for it, and automatic drain empties itself continuously. This unit carries the fine 5 um element (code W); the 40 um standard element is the choice where only coarse protection is needed. The embedded square gauge here reads in bar, with MPa or psi scales and an external round gauge available as options. Thread is NPT on this unit; PT is the catalogue standard and G (BSPP) is also orderable. A bracket is included, and the K code means a reverse/check valve is already fitted.
Because flow is published as curves and not as a single rated number, we cannot honestly quote one figure here - 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR400 series as curves, not as a single rated number, so we do not quote a figure we cannot stand behind. Send us your application details and we will confirm the flow and sizing figures from the datasheet before you order.
The M code means the polycarbonate bowl is drained by hand: someone opens the drain on a routine instead of relying on an automatic mechanism. Manual drain also widens the regulator adjustment range to 0.05-0.9 MPa (7-130 psi), versus 0.15-0.9 MPa (20-130 psi) on the automatic and differential-pressure drain versions. Choose manual where a operator is already on site and you want the wider adjustment span; choose automatic or differential-pressure drain where the unit is unattended.
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.