The AirTAC GFR400-10 AirTAC Filter Regulator NPT3/8 Low-Pressure 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, so you clean and control the air with one component instead of two. This size 400 unit is fitted with a 3/8 in NPT port, a 40 um standard filter element, and an automatic drain that expels collected condensate without anyone having to open the bowl. It is the low-pressure type, and it comes with an external round gauge scaled in bar so the set pressure is readable at a glance. The polycarbonate bowl suits the -5 to 70 C (non-freezing) operating range, and maximum inlet pressure is 1.0 MPa (145 psi).
This is a genuine AirTAC part. The GFR family is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, in PT (standard), G and NPT threads, with manual, automatic or differential-pressure drains, 40 um or 5 um (W) filtration, standard or low-pressure regulation, gauge and bracket options, and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application.
| Model | GFR400-10 AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| 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 | 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 | 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". |
| 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. |
| (blank) | Mounting bracket included. |
| (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. |
| (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 low-pressure clamping or forming fixture, the GFR400-10 cleans the shop air to 40 um, drops it to the fixture's working pressure, and its automatic drain keeps condensate out of the cylinder between cycles.
Feeding valves and actuators on a carton or shrink-wrap line, this filter regulator gives one clean, regulated supply point, with the bar-scale round gauge letting operators verify set pressure during changeover.
For test rigs and lab apparatus that run at modest pressures, the low-pressure type regulator holds a gentle, stable setting while the 40 um element and auto drain protect sensitive instruments from water and debris.
Start with the size and port: 400 is the second-largest GFR size, and the 3/8 in port here must match your line - step up to 600 or down to 300/200 if your flow demand or piping differs. Because this is the low-pressure (L) type, choose it where the working pressure sits below what a standard regulator targets; the exact adjustment range for the low-pressure type is not published, so confirm it with us against your setpoint before ordering. The 40 um element is the standard grade; if you need finer filtration, the 5 um (W) variant is the decodable alternative. The automatic drain suits unattended duty; manual and differential-pressure drains are the other options. Thread: PT is the AirTAC standard, G and NPT are order options - this unit is the NPT version. Bracket is included, and the round bar gauge is fitted; embedded square gauges with MPa/psi/bar scales are the alternative.
One honest note on sizing: AirTAC publishes flow for this family as curves, not a single rated number, so we cannot quote you a rated flow figure. Send us your application conditions and we will confirm the right size from 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 family as performance curves, not as a single rated figure, so we do not quote a rated flow number. Tell us your application conditions and we will confirm the sizing from the datasheet on request before you order.
The A in the code means the bowl drains itself: collected condensate is expelled automatically, so no one has to bleed the bowl by hand - useful on unattended equipment. The L means this is the low-pressure regulator type rather than the standard type; its exact adjustment range is not published, so confirm it with us against your setpoint.
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.