The AirTAC GFR400-10 NPT AirTAC Filter Regulator, 3/8 in 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 GFR400-10 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and holds downstream pressure in one body. This configuration is built on the size 400 frame with a 3/8 in NPT port, an automatic drain that discharges collected condensate without manual attention, standard 40 um filtration, the low-pressure regulator type, an embedded square MPa gauge, and a reverse (check) valve fitted. No mounting bracket is included with this code.
It is a genuine AirTAC part. The GFR400 series is offered across the 200/300/400/600 size range in ports from 1/8 in to 1 in, with manual, automatic or differential-pressure drains, an optional 5 um element (code W), gauge scales of MPa, psi or bar, and G (BSPP) or NPT threads in place of the PT standard. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm sizing and datasheet figures for your application.
| Model | GFR400-10 NPT AirTAC Filter Regulator, 3/8 in 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 — square, MPa 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 1 | Gauge scale: MPa. 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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Feeds clamp cylinders on a machining or assembly fixture where parts must be held with a gentle, steady regulated pressure, while the filter element keeps moisture and pipe scale out of the clamp valves.
Sits at the drop for a packaging conveyor's gate and diverter cylinders, cleaning the shop air and holding a low, stable working pressure so gates stroke consistently without slamming.
Conditions the air going to spray guns in a finishing booth: the 40 um element strips water that would cause fisheyes in the finish, and the low-pressure regulator sets the gentle gun pressure the coating calls for.
Match the size 400 / 3/8 in port step to the air your circuit actually consumes; larger sizes carry more flow, and we will check the published flow curve against your demand before you order. This configuration is fixed as automatic drain, 40 um element, low-pressure regulator type, square MPa gauge, NPT thread, fitted check valve and no bracket. If you need the 5 um element, a manual or differential-pressure drain, a psi or bar gauge scale, G (BSPP) thread or a mounting bracket, tell us and we will match the correct code. The low-pressure type is intended where only low regulated pressures are needed; its exact adjustment range is not published, so confirm it with us.
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 GFR400 series as curves, not as a single rated figure, so we do not quote a number here. Send us your application's air demand and working pressure and we will confirm the correct size from the datasheet before you order.
L marks the low-pressure regulator type: the unit regulates to lower downstream pressures than the standard GFR400. The exact adjustment range for the low-pressure type is not published, so confirm it with us. The rest of the code decodes as automatic drain, 40 um filtration, no bracket, square MPa gauge, NPT thread and a fitted reverse (check) valve.
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.