The AirTAC GFR400-10LJNTK 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 GFR400-10LJNTK is a filter regulator: it removes water and particulate from compressed air and reduces pressure to the level your circuit needs, in a single 400-size body with a 3/8 in NPT port. This configuration is the low-pressure (L) type for circuits that run at reduced pressure, with a 40 um standard filter element, a differential-pressure drain on the polycarbonate bowl, and a built-in reverse/check valve. No pressure gauge is fitted (code N) and no mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part from the GFR400 series, one size within the GFR filter-regulator range that spans sizes 200, 300, 400 and 600 with progressively larger ports and flow capacity. Related configurations offer a 5 um element (code W), automatic or manual drains, gauge options, G (BSPP) or NPT threads in addition to the PT standard, and bracket variants. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing or any datasheet figure for your application before ordering.
| Model | GFR400-10LJNTK 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 | Not fitted |
| 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. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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 filtered, reduced-pressure air to pneumatic clamps and swing cylinders on machining fixtures that run below standard line pressure. The fitted check valve helps hold the downstream setting against momentary supply dips.
Conditions air for cylinder-driven pushers, diverters and grippers on packaging and conveying lines. The 3/8 in NPT port and 40 um element protect small actuators and valve spools from water and pipe scale.
Installed at the take-off point of a plant air ring to filter and regulate supply to a single assembly station running at reduced pressure, keeping the station isolated from header pressure fluctuations.
Choose the size and port step against the air your line actually consumes: this 400-size unit carries a 3/8 in port, and moving up or down within GFR400 (or to sizes 200/300/600) changes both the connection and the flow capacity. Because flow is published as curves rather than a single rating, send us your required flow and working pressure and we will confirm the correct size from the datasheet before you order. Drain type is a real choice: this unit uses the differential-pressure drain (the default), while automatic (A) and manual (M) drains are available in the series. Filter grade is another: the 40 um element fitted here is standard, and the 5 um (W) option suits finer applications. Note that this is the low-pressure (L) type, selected for circuits operating at reduced pressure; its exact adjustment range is not published, so confirm it with us. Gauge, thread (PT standard, G and NPT as options) and bracket choices complete the configuration; this unit ships without a gauge or bracket as coded.
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 curves rather than a single rated figure, so we do not quote a number. Send us your required flow, working pressure and port size, and we will confirm suitability from the datasheet before you order.
Correct: the N code means no pressure gauge is supplied with this unit. Gauges are an option on GFR filter regulators - an embedded square gauge or an external round gauge, with MPa, psi or bar scales - and can be specified in the model code when ordering.
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.