The AirTAC AirTAC GFR400-10T Filter Regulator NPT 3/8, 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 differential-pressure 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.
This GFR400-series filter regulator combines water and particulate filtration with pressure regulation in a single body. This configuration is a size 400 unit with a 3/8 in NPT thread and the low-pressure regulator type, so it suits circuits that run below standard line pressure. Filtration is the 40 um standard element, and the differential-pressure drain bleeds accumulated condensate out of the polycarbonate bowl automatically as the pressure differential across the element rises - no daily manual draining. An embedded square gauge scaled in MPa is fitted for setting the outlet pressure, a reverse (check) valve is included to hold downstream pressure if the supply drops, and a mounting bracket is included for panel or frame mounting.
This is a genuine AirTAC part. The GFR family is made in sizes 200, 300, 400 and 600, with port sizes from 1/8 in to 1 in and PT, G(BSPP) or NPT threads, plus optional 5 um filtration, automatic or manual drains, and alternative gauge scales. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing). AirTAC publishes flow for this family only as curves rather than a single rated figure, so ask us to confirm the sizing and full datasheet figures for your application.
| Model | AirTAC GFR400-10T Filter Regulator NPT 3/8, 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 | Differential-pressure 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". |
| (blank) | Drain: Differential-pressure 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). |
| 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) |
Feeding filtered, low-pressure regulated air to clamps and fixtures on a CNC machining cell, where the check valve holds the clamp position if the shop supply dips mid-cycle.
Conditioning the air feeding gate and diverter cylinders on a packaging or sorting conveyor, keeping condensate out of the valves while holding a gentle regulated pressure for light-duty actuators.
Protecting low-pressure actuation circuits on factory process equipment, where the 40 um element stops particulate reaching sensitive valves and the differential-pressure drain keeps the bowl clear without operator rounds.
Choose the size step (200/300/400/600) and port (1/8 in to 1 in) against the air demand of the circuit; this unit is the size 400, 3/8 in NPT step. Drain choice is differential-pressure (this unit - no operator attention needed), automatic, or manual; filter grade is 40 um standard with 5 um (code W) where finer filtration is required. The L in this code marks the low-pressure regulator type; its exact adjustment range is not published in the catalogue, so confirm it with us before ordering. Gauge scale (MPa, psi or bar), PT vs G vs NPT thread and the mounting bracket are the remaining decodable choices. Because flow is published as curves rather than a single rating, ask us to confirm sizing against your application 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 only as curves, not as a single rated figure, so we do not quote a number here. Tell us your application and we will confirm the flow and the full datasheet figures for this GFR400-10T configuration on request.
It marks the low-pressure regulator type, intended for circuits running below standard line pressure. The catalogue does not publish an exact adjustment range for the low-pressure version, so we confirm it on request. The fitted gauge is the embedded square type scaled in MPa; an external round gauge and psi or bar scales are available as options.
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.