The AirTAC GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, Auto 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 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: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This size 400 unit has 3/8 in NPT ports, 40 um standard filtration, an automatic drain that expels collected condensate without manual attention, and a round psi gauge fitted. A reverse/check valve is included, and the unit comes with a mounting bracket.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, drain, filter-grade, gauge, thread and reverse-valve options. Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, Auto Drain |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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 | 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. 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. |
| (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. |
| (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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Feeding a plant-air drop that serves a pneumatic press station: the element strips water and pipe scale, and the regulator holds a steady working pressure to the press cylinder while the auto drain keeps the bowl clear between shifts.
Conditioning the air feed to a packaging conveyor's diverters and clamp cylinders, where stable regulated pressure keeps cycle behaviour consistent and the automatic drain removes condensate without a daily walk-round.
Supplying filtered, regulated air to a laboratory automation skid with solenoid valves and small actuators, where the reverse/check valve holds downstream pressure if supply dips and the psi gauge gives a local setpoint readout.
Size 400 with 3/8 in ports suits lines where moderate-to-high air demand runs through a single treatment point; step up or down a size if your flow curve calls for it. The automatic drain suits unattended or hard-to-reach installations; manual and differential-pressure drains are available in the family if you prefer operator-controlled or pressure-differential draining. Filtration is 40 um standard, with a 5 um element (code W) where downstream equipment needs finer protection. Thread is NPT here; PT is the standard catalogue thread and G (BSPP) is also an order option. A bracket is included, and gauge scales can be specified in MPa, psi or bar.
Because flow is published as curves and not a single rated figure, ask us to confirm sizing against your application before ordering.
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 this series as curves rather than a single rated number, so we do not quote a figure here. Tell us your application and we will confirm the flow data from the datasheet on request before you order.
The A in the code GFR40010AC2TK specifies an automatic drain, which expels collected condensate on its own - useful for unattended installations. The GFR family is also available with manual or differential-pressure drains, so you can order the drain style that matches how the unit is maintained.
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.