The AirTAC GFR400-10 AirTAC Filter Regulator 3/8in NPT Auto Drain 5um 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 size 400 filter regulator: it removes water and particulate from compressed air and holds downstream pressure in a single body. This configuration is built with a 3/8 in NPT port, a 5 um filter element (the finer of the two catalogue grades), an automatic drain that ejects collected condensate without daily manual attention, and a low-pressure regulator fitted with an external round gauge reading in bar. A reverse/check valve is fitted and a mounting bracket is included.
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, a choice of PT (standard), G or NPT thread, manual, automatic or differential-pressure drains, 40 um or 5 um elements, and square or round gauges in MPa, psi or bar scales. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm figures from the datasheet for your application.
| Model | GFR400-10 AirTAC Filter Regulator 3/8in NPT Auto Drain 5um |
|---|---|
| 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. |
| (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. |
| 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) |
Filtered, regulated supply ahead of the directional control valves on a food-packaging line's pick-and-place actuators, with the 5 um element keeping pilot-air passages clean and the automatic drain handling condensate between shifts.
A low-pressure regulated drop feeding air-assisted spray guns in a paint finishing booth, where the bar gauge gives the operator a local pressure readout and the automatic drain copes with humid summer intake air.
Conditioned air to the pneumatic clamping circuit of a CNC machining cell, with the reverse/check valve helping hold the regulated circuit and the bracket allowing tidy mounting at the machine frame.
Size 400 with a 3/8 in port sits in the middle of the GFR range; step up to size 600 or down to 300 if your line's air demand points elsewhere - we can check the flow curves against your application before you order. The 5 um element (code W) suits air that feeds sensitive valves and instruments; the standard grade is 40 um. The automatic drain suits unattended duty, with manual and differential-pressure drains as the alternatives. The round gauge on this unit reads in bar; the embedded square gauge and MPa or psi scales are catalogue options. PT is the standard thread and G or NPT are order options - this unit is specified with NPT. A mounting bracket is included. The low-pressure regulator type is selected where a lower control band is needed; confirm the exact range with us 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 G-series flow as curves rather than a single rated figure, so we do not quote a number here. Send us your application's flow and pressure requirements and we will confirm sizing from the datasheet before you order.
Code A specifies the automatic drain, which ejects collected condensate without daily manual attention. The catalogue also offers manual and differential-pressure drains on this family; tell us which suits your maintenance routine and we can quote that variant.
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.