The AirTAC GFR400-10 AirTAC Filter Regulator NPT3/8 5 um Auto Drain 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 automatic 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: one body that removes water and particulate from compressed air and then regulates downstream pressure. This configuration is the size 400 unit with a 3/8 in NPT port, a fine 5 um filter element (the W grade, one step finer than the 40 um standard), and an automatic drain that bleeds collected condensate from the PC bowl without anyone having to open it. The regulator is the standard type with an adjustment range of 0.15-0.9 MPa (20-130 psi), and this unit is ordered without a gauge (code N), so add a gauge separately if you want a local pressure readout. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. A mounting bracket is included.
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 differential-pressure, automatic or manual drain, 40 um or 5 um filtration, gauge options, and PT, G or NPT threads. Flow for this series is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet and flow figures for your application on request.
| Model | GFR400-10 AirTAC Filter Regulator NPT3/8 5 um Auto Drain |
|---|---|
| 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 | 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 | Automatic 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| 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) |
Clean, regulated air feeding tool changers, clamps and pneumatic actuators on a machining centre, with the 5 um element protecting fine valve spools and the automatic drain keeping condensate out of the circuit during unattended shifts.
Pressure regulation for the cylinders and air-driven sealers on a carton or shrink-wrap packaging line, where a stable setpoint keeps cycle timing consistent and the auto-drain bowl handles moisture from a long compressed-air run.
A filtered, regulated drop at a workbench or tool station running impact wrenches, grinders and air ratchets, with the 5 um grade stopping rust and pipe scale from reaching the tools and the automatic drain sparing the operator daily bowl checks.
Step through the real choices before ordering. Size 400 with a 3/8 in port sits in the middle of the GFR range; if your line flow demand is higher, step up to size 600, and if it is lighter, size 200 or 300 with a smaller port may suit. Drain type matters day to day: automatic drain (this unit) empties the bowl on its own, manual drain relies on an operator, and the differential-pressure default drains on a pressure drop. The 5 um element here is the finer of the two published grades (40 um is standard), so choose it when downstream equipment needs cleaner air. This unit carries no gauge and no reverse/check valve; gauge and scale options exist on the family if you want one. Thread is NPT here, with PT as the catalogue standard and G (BSPP) also available - order the suffix you need. A bracket is included. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application 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 curves, not as a single rated number, so we do not quote a rated flow, Cv or SCFM figure for this unit. Tell us your application and line conditions and we will confirm the datasheet and flow-curve figures on request so you can size it correctly before ordering.
This model is ordered with gauge code N, so no pressure gauge is fitted; gauge options with different scales are available on the GFR family if you want a local readout. The automatic drain bleeds collected condensate from the PC bowl by itself, unlike the manual-drain version which needs an operator, or the differential-pressure default which drains on a pressure drop.
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.