The AirTAC GFR400-10 AirTAC Filter Regulator 3/8in NPT 5um 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 GFR400-10 is an AirTAC GFR filter regulator: a single body that removes water and particulate from compressed air and regulates downstream pressure. This unit is built on the size 400 body with a 3/8 in NPT port, the 5 um filter element (code W, against the 40 um standard), and an automatic drain that ejects collected condensate without anyone opening a valve. It is specified in the low-pressure regulator type, carries a round external gauge scaled in bar and a reverse/check valve, and is supplied without a mounting bracket. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, and options across drain type, filter grade, gauge style and scale, thread (PT standard; G and NPT as order options) and bracket. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request before you order.
| Model | GFR400-10 AirTAC Filter Regulator 3/8in NPT 5um 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 | 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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. 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". |
| A | Drain: Automatic 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. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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) |
On an assembly fixture where clamping cylinders run at reduced pressure, this unit filters the supply to 5 um ahead of the directional valves and regulates the circuit with the low-pressure type. The automatic drain clears condensate between shifts without operator attention, and the round bar gauge gives a local setpoint check at the cell.
A machining centre's tool changer and part clamps need clean, steady air at the manifold. This filter regulator conditions the branch feeding the solenoid valves, the 5 um element protects valve seals from particulate, and the fitted check valve blocks backflow at the inlet. The bar-scaled gauge lets a setter verify the line pressure at a glance.
Finishing equipment such as spray guns and coating applicators is sensitive to both water carryover and supply fluctuation. This unit strips moisture and particles to 5 um, holds the application pressure with the low-pressure regulator type, and its automatic drain keeps the bowl clear through a full production run without manual blowdown.
Size 400 with a 3/8 in NPT port sits mid-range in the GFR line; step down to 300/200 or up to 600 as your flow demand dictates, and we will check the published flow curves against your application on request. This configuration is specified with the 5 um element rather than the 40 um standard, an automatic drain instead of manual or differential-pressure, the low-pressure regulator type, a round external gauge scaled in bar, a reverse/check valve, and no mounting bracket. Thread here is NPT; PT is the catalogue standard and G (BSPP) is also an order option. The operating window is 1.0 MPa (145 psi) maximum inlet and -5 to 70 C, non-freezing.
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 GFR series as curves, not as a single rated figure, so we do not quote a number here. Send us your required flow and working pressure and we will confirm the sizing against the datasheet on request before you order.
The L code specifies AirTAC's low-pressure regulator variant instead of the standard type. The exact regulating range for this variant is not published in our data, so tell us your setpoint and we will verify suitability against the catalogue on request.
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.