The AirTAC GFR400-10 AirTAC Low-Pressure Filter Regulator 3/8 NPT 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 low-pressure filter regulator: one compact body that removes water and particulate from compressed air and holds a preset downstream pressure. This size 400 configuration is supplied with a 3/8 in NPT port, an automatic drain that ejects collected condensate without manual attention, a fine 5 um filter element, a round pressure gauge reading in bar, and a mounting bracket. The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part. The GFR series is available in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, in PT, G and NPT threads, with manual, automatic or differential-pressure drains, 40 um or 5 um elements, and square or round gauges. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). Flow is published as curves rather than a single rating, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-10 AirTAC Low-Pressure Filter Regulator 3/8 NPT |
|---|---|
| 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 | 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. |
| 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) |
Filtered, low-pressure regulated air supplied to spray guns in a paint finishing booth, with the 5 um element helping keep oil and water carryover out of the finish and the automatic drain handling condensate through long spray shifts.
A conditioning point ahead of the air cylinders that drive pick-and-place heads on a carton or bottle packaging line, holding a steady low regulated pressure so gripper and pusher strokes stay repeatable from cycle to cycle.
Clean, regulated air feeding the clamping cylinders on a CNC machining fixture, where the 5 um element protects the clamp valves and the round bar gauge gives the operator a direct reading of clamp circuit pressure.
Size 400 with a 3/8 in port suits lines whose air consumption sits in the mid range of the GFR family; step up to size 600 or down to 300 depending on the flow curve your circuit needs - we will check the curve against your demand on request. The 5 um element (code W) is the finer choice where downstream valves, cylinders or instruments tolerate less particulate than the 40 um standard element removes. The automatic drain on this unit suits unmanned or hard-to-reach installations; manual and differential-pressure drains are orderable alternatives. The low-pressure regulator variant is selected where the working setting sits below the standard type's range - the exact adjustment range for this variant is not published, so confirm it with us. The round gauge on this code reads in bar; square embedded gauges and MPa or psi scales are the other catalogue options. NPT is the thread on this code; PT (standard) and G are also available, and the mounting bracket is included.
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 performance curves, not as a single rated figure, so we do not quote a number on the product page. Send us your line pressure and the air consumption of the equipment you are feeding, and we will confirm the datasheet curve and check the sizing for your application before you order.
This code carries drain type A, an automatic drain that discharges collected condensate from the polycarbonate bowl on its own, which suits unmanned cells, elevated mounting points or any installation that is awkward to reach. The catalogue alternatives are manual drain (code M), where an operator drains the bowl, and the differential-pressure default, which drains on a pressure drop; all three are orderable on this series.
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.