The AirTAC GFR40010LJF3TK 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 series is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration, the GFR40010LJF3TK, is the size 400 unit with a 3/8 in NPT port, the standard 40 um filter element, and a differential-pressure drain that bleeds collected condensate automatically whenever the pressure differential across the element is high enough. The regulator is the low-pressure type, intended for circuits that hold lower set pressures than a standard unit is set up for. It comes fitted with the embedded square gauge scaled in bar and a reverse/check valve that holds downstream pressure if the supply is interrupted, and it is supplied without a mounting bracket. Maximum working (inlet) pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C, non-freezing.
This is a genuine AirTAC part. The GFR filter-regulator family is published in sizes 200, 300, 400 and 600, with a choice of port sizes, PT (standard), G or NPT threads, differential-pressure, automatic or manual drains, a 40 um standard or 5 um (code W) filter element, standard or low-pressure regulation, gauge scale options, and a reverse/check valve. Flow figures for this series are published as curves rather than a single rated number, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR40010LJF3TK 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 — square, bar 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). |
| F | Gauge shape: Square. C is round, F is square. |
| 3 | Gauge scale: bar. 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) |
On a press or fixture where workpieces must be held at a gentler set pressure than the main shop air line, this low-pressure type filter regulator cleans the supply, holds the reduced setting, and the check valve keeps the clamp from venting if the main supply drops.
Packaging lines run many small cylinders and grippers off one drop. A filter regulator at the head of the drop removes water and pipe scale that would score seals, gives the machine a stable, lower set pressure, and the differential-pressure drain keeps condensate moving without daily attention.
Bench-top test rigs and analytical instruments need clean, steady air at modest pressures. This unit filters the shop supply to 40 um, regulates it down with the low-pressure regulator, and the bar-scaled gauge gives the operator a direct local reading at the panel.
Start with the port and size step: the GFR400 carries a 3/8 in port, and moving up or down a size (200/300/400/600) changes both the port and the flow capacity, so size the unit against the air demand of the circuit rather than the pipe alone. For the drain, the differential-pressure type fitted here is the fit-and-forget default; choose automatic (code A) for a positive timed purge or manual (code M) where you want drain control in hand. The 40 um element is the standard grade; specify 5 um (code W) only where downstream equipment genuinely needs finer filtration. The embedded square gauge is standard, with an external round gauge and MPa, psi or bar scales as options; this unit is scaled in bar. Thread is NPT here, with PT (the catalogue standard) and G available to order, and a bracket can be added if this one is ordered without (code J). Because flow is published as curves rather than a single rating, send us your application details 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR series as curves, not as a single rated number, so we do not quote a figure here. Send us your application details and we will confirm the datasheet flow curve and help you check that the size 400, 3/8 in port unit is correctly sized before you order.
The L in the code marks this as the low-pressure regulator type, intended for circuits that hold lower set pressures than the standard version; the exact adjustment range for this variant is not published in the sheet we work from, so ask us to confirm it. The drain is the differential-pressure type: it discharges collected condensate automatically when the pressure differential across the 40 um element rises, with no operator action needed.
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.