The AirTAC GFR400-10 AirTAC Filter Regulator 3/8 in NPT, 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. This unit is built on the size-400 frame with a 3/8 in NPT port, an automatic drain that expels collected condensate without anyone having to open the bowl, and the standard 40 um filter element. It is the low-pressure type, intended for circuits that run below standard regulator settings, and it carries an external round gauge scaled in psi. The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, and options including manual or differential-pressure drains, a 5 um element (code W), square or round gauges with MPa, psi or bar scales, and G or NPT threads in place of the PT standard. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator 3/8 in NPT, 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, psi 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. |
| J | Supplied without bracket. |
| (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. |
| (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) |
Feeds filtered, pressure-controlled air to carton-sealing and case-erecting cylinders on a packaging line, with the automatic drain handling condensate on a line that runs unattended through shifts.
Supplies clean, regulated air to actuated butterfly and diaphragm valves in a treatment process, where the low-pressure type suits circuits that operate well below standard regulator settings.
Conditions the air feeding diverter gates, stoppers and pusher cylinders along a conveyor system, keeping water and debris out of the valves while holding a steady set pressure.
Step through the GFR sizes (200/300/400/600) to match the port your circuit needs; this unit sits at size 400 with a 3/8 in NPT port. Choose the drain to suit access: automatic (as here) for unattended condensate removal, manual for periodic checks, or the differential-pressure default. The standard element is 40 um; specify code W for 5 um where finer filtration matters. Gauges come as an embedded square type or an external round type with MPa, psi or bar scales; this configuration carries a round psi gauge. Thread is NPT here; PT is the standard and G is an order option. A mounting bracket can be included or omitted (omitted here, code J). Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. As a low-pressure type unit, its exact regulation range is not published in the standard table, so ask us to confirm it. Because flow is published as curves rather than a single rating, send us your flow and pressure requirements and we will confirm sizing against 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 this family as curves rather than a single rated figure, so we do not quote a number on the page. Tell us your required flow and working pressure and we will confirm the sizing from the datasheet before you order.
The automatic drain expels collected condensate on its own, which suits units mounted in awkward spots or on lines that run unattended. The alternatives are a manual drain, where someone opens the bowl periodically, and the differential-pressure drain, which is the catalogue default. All three are order choices on the GFR family.
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.