The AirTAC GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, Manual Drain is a genuine G-series filter regulator: water separation, 40 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: one body that removes water and particulate from compressed air and then regulates downstream pressure. This size 400 unit is fitted with a 3/8 in NPT port, a manual drain on the PC (polycarbonate) bowl, and a standard 40 um filter element. The set outlet pressure is adjusted across 0.05-0.9 MPa (7-130 psi), and the embedded square gauge reads in bar. A mounting bracket is included; no reverse/check valve is fitted.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in. Drain types (differential-pressure, automatic or manual), a 5 um element (code W), gauge scales in MPa, psi or bar, and G (BSPP) or NPT threads are available in the family. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application.
| Model | GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, Manual Drain |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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 | 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 0.05 - 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. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
On a production press fed by a plant air ring main, this unit cleans water and scale from the supply at 40 um and holds a fixed clamping pressure on the cylinders, with the bar-scale gauge giving the operator a direct setting reference.
On a carton packaging line, air cylinders actuate diverters, flaps and sealing bars. This filter regulator mounted at the line drop keeps moisture out of the valves and holds steady actuation pressure, with the manual drain emptied at shift checks.
On a lab test bench or pilot rig where instruments and small actuators run off compressed air, this unit filters the supply and lets a technician dial in a repeatable test pressure, reading the setpoint directly off the square bar gauge.
Start with the port and size step: this unit is size 400 with a 3/8 in NPT port; if your line needs more flow, the size 600 step gives a larger port and larger body. Choose the drain to suit the installation - the manual drain on this unit needs someone to open it, while automatic and differential-pressure drains discharge condensate without attention. The standard element is 40 um; specify the W option for 5 um where finer filtration is needed. The embedded square gauge is standard (bar scale here) and an external round gauge in MPa, psi or bar is optional. PT is the standard thread; G (BSPP) and NPT are catalogue options to order, and a bracket is included on this unit.
Flow for this family is published as curves, not a single rated number, so we cannot quote a rated flow 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. 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 figure, so we do not quote a rated flow, Cv or SCFM number. Send us your application - port size, upstream pressure and the flow your equipment needs - and we will confirm the sizing against the datasheet before you order.
The M in the code means the PC bowl has a manual drain: condensate collects in the bowl and someone opens the drain at service intervals. If the unit will be mounted where it is hard to reach, the automatic drain (code A) discharges condensate on its own, and the differential-pressure drain (blank) is the default. Note that with a manual drain the regulator adjustment range is 0.05-0.9 MPa (7-130 psi).
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.