The AirTAC GFR400-10 AirTAC Filter Regulator, NPT 3/8, 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 regulates downstream pressure in a single body. This size 400 unit is supplied with NPT 3/8 ports, a 5 um filter element (the finer of the two published grades), and a differential-pressure drain that bleeds accumulated condensate automatically as the pressure differential across the element rises. It is the low-pressure type, is fitted without a pressure gauge, without a mounting bracket, and without a reverse/check valve, and carries a maximum inlet pressure of 1.0 MPa (145 psi) with an operating temperature range of -5 to 70 C (non-freezing). The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part. The GFR filter-regulator family is available in sizes 200, 300, 400 and 600 with a choice of port sizes, PT (standard), G or NPT threads, 40 um standard or 5 um (W) filtration, differential-pressure, automatic or manual drains, gauge and bracket options, and standard or low-pressure regulator types. Flow is published as curves rather than a single rated figure, so we confirm the datasheet figures for your application on request.
| Model | GFR400-10 AirTAC Filter Regulator, NPT 3/8, 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 | 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". |
| (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. |
| 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) |
Feeding filtered, regulated air to the cylinders and actuators on a carton-forming or wrapping line, where the 5 um element protects valve spools from fine particulate and the low-pressure regulator type matches reduced working-pressure circuits.
Conditioning shop air ahead of spray booths and air-assisted applicators, where water carry-over ruins finishes; the polycarbonate bowl shows condensate build-up and the differential-pressure drain keeps the element working without daily manual draining.
Serving as the single conditioning point for a control cabinet's air supply, combining filtration and regulation in one body to save panel space on a 3/8 in branch, with the finer 5 um grade protecting pilot valves and positioners.
Size 400 with 3/8 in ports sits in the upper-middle of the GFR range; step up to size 600 or down to size 300 depending on the flow your line needs - we will confirm the published flow curve against your demand before you order. The 5 um element (code W) suits applications that need finer particulate removal than the 40 um standard grade; both grades are available across the family. The differential-pressure drain on this unit handles condensate automatically; automatic (A) and manual (M) drain versions can be quoted if you prefer a different drainage behaviour.
This is the low-pressure regulator type, so if your circuit runs at reduced working pressures this is the correct variant - ask us to confirm the exact adjustment band from the datasheet. No pressure gauge is fitted with this code; gauge options and scale choices exist elsewhere in the family. NPT is the thread on this unit; PT (standard) and G are orderable alternatives. Brackets are optional, and this code is supplied without one.
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, not as a single rated number, so we do not quote a rated flow figure for this unit. Tell us your line's air demand and we will confirm the datasheet curve for the GFR400-10 against your application before you order.
The code GFR40010LJNWT carries no drain letter, so it is the differential-pressure drain: condensate is discharged automatically as the pressure differential across the 5 um element builds. If you prefer a fully automatic (code A) or manual (code M) drain, those variants are available in the GFR400 series and we can quote them.
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.