The AirTAC GFR400-10L AirTAC Filter Regulator, NPT3/8, 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.
The AirTAC GFR400-10LJC2TK is a filter regulator: water and particulate removal plus pressure regulation combined in a single body. This size-400 unit is built with a 3/8 in NPT port and is the low-pressure (L) type, intended for circuits where the working pressure sits below the standard regulator band. It carries the standard 40 um filter element, a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the element is high enough, and a polycarbonate bowl. A reverse/check valve (code K) is fitted to hold downstream pressure when the supply is lost, and the code C2 specifies the external round gauge with a psi scale. No mounting bracket is included (code J).
This is a genuine AirTAC part in the GFR400 size class, one of four sizes (200, 300, 400, 600) that step up in port and flow capacity. Across the GFR family you can order manual or automatic drains, a 5 um element (code W), square or round gauges with MPa, psi or bar scales, G or NPT threads in place of the PT standard, and brackets. Because AirTAC publishes flow only as curves rather than a single rated figure, we confirm the datasheet and sizing figures for your application on request.
| Model | GFR400-10L AirTAC Filter Regulator, NPT3/8, 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 — round, psi 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. |
| 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. |
| 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) |
Fixture clamps that must close gently on painted or thin-walled parts run at reduced pressure. This filter regulator cleans the supply, holds a low set point at the clamp manifold, and its check valve keeps the clamps from releasing if the main air drops.
Carton sealers and case packers often run short-stroke cylinders at deliberately low pressure to avoid crushing product. Feeding that zone through this unit gives the machine its own filtered, regulated supply on a 3/8 in NPT drop from the main line.
Bench-scale process skids and test rigs frequently need air supplied well below line pressure to actuate valves or agitators. The low-pressure type regulator with a psi-scaled round gauge lets operators read and hold the set point directly, with the 40 um element protecting the instruments.
Start with the port step: size 400 in a 3/8 in NPT thread suits lines whose supply plumbing is built around 3/8 in piping; if your demand sits at the top of this size's capacity, step up to size 600. This unit is the low-pressure (L) type, so choose it when your set point falls in the lower part of the regulator's working band - the exact low-pressure range is not published in the material we hold, so ask us to confirm it against your set point before ordering. The drain here is differential-pressure; if your flow is often very low or intermittent, a manual (M) or automatic (A) drain may suit better. The 40 um element is the standard grade; specify W for the 5 um option where downstream equipment needs finer filtration. The round gauge is ordered with a psi scale here, and MPa or bar scales are available. Thread is NPT on this code; PT is the catalogue standard and G (BSPP) is also orderable. Brackets are optional (this code omits one).
One honest note on sizing: AirTAC publishes flow as curves, not a single rated number, so we do not quote a rated flow figure. Send us your application's flow and pressure requirements and we will confirm the fit from the datasheet before you order.
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 this series as performance curves rather than a single rated figure, so we do not quote a rated flow number. Send us your required flow and working pressures and we will confirm the sizing from the datasheet on request before you order.
The L in the code marks this as the low-pressure regulator type, intended for set points below the standard regulator band. The exact low-pressure adjustment range is not published in the material we hold, so please confirm your target set point with us on request. The unit is otherwise a standard filter regulator: 40 um filtration, differential-pressure drain, and a maximum inlet pressure of 1.0 MPa (145 psi).
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.