The AirTAC GFR400-10LJ AirTAC 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.
The AirTAC GFR400-10LJ is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This 400-size unit is fitted with a 3/8 in NPT port. It is the low-pressure (L) type, so it is intended for circuits where the working pressure sits below the standard regulator band - the exact adjustment range for this variant is confirmed on request. The 40 um filter element is the standard grade, the differential-pressure drain bleeds collected condensate automatically as flow passes through, and the round external gauge (MPa scale) gives a clear local pressure readout. A reverse/check valve is fitted to hold downstream pressure if the upstream supply drops, and the unit is supplied without a mounting bracket.
This is a genuine AirTAC part from the GFR filter-regulator family, which spans the 200, 300, 400 and 600 sizes with port options from 1/8 in to 1 in, manual or automatic drain variants, a 5 um (W) element option, gauge and scale choices, and PT, G or NPT threads. Flow figures for this series are published as curves rather than a single rating, so ask us to confirm sizing and datasheet details against your application before ordering.
| Model | GFR400-10LJ AirTAC 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 — round, 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| C | Gauge shape: Round. 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) |
On a fixture or jig line where clamps are held at reduced pressure to avoid marking the workpiece, the low-pressure type regulator sets the holding pressure while the 40 um element keeps contaminants out of the clamp cylinders, and the check valve holds the clamp if supply pressure dips.
Feeding the pick-and-place and sealing cylinders on a packaging conveyor, this 3/8 in filter regulator cleans the shop air of water and particulate, holds a steady set pressure for consistent motion, and its differential-pressure drain clears condensate as the line runs.
On a lab bench or test rig running instruments and small actuators at reduced pressure, the low-pressure regulator gives finer control in the lower band, the round MPa gauge provides a local readout, and the 40 um filter protects sensitive downstream devices.
Start with the port step: this unit is the 400 size with a 3/8 in NPT port; if your line needs more or less flow capacity, the GFR family steps through 200/300/400/600 with ports from 1/8 in to 1 in. Drain choice matters: differential-pressure (this unit) drains with flow, automatic (code A) drains on its own cycle, and manual (code M) needs an operator - the manual variant also widens the standard adjustment range downward. The 40 um element here is the standard grade; specify W for the 5 um element where finer filtration is needed. Gauge options are the embedded square gauge or this external round gauge, with MPa, psi or bar scales. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also orderable. Brackets are optional (this unit omits one, code J), and the K code adds the reverse/check valve fitted here. Note this is the low-pressure (L) type - its adjustment range is not published in the standard table, so confirm it with us. Flow for the whole series is published as curves, not a single rated figure, so 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 flow for the GFR series as curves rather than a single rated figure, so there is no one rated flow number we can quote. Send us your application details and we will confirm the flow and sizing from the datasheet on request before you order.
L marks the low-pressure regulator type, intended for circuits where the working pressure sits below the standard adjustment band; the exact adjustment range for the low-pressure variant is not published in the standard table, so we confirm it on request. The rest of this code decodes as: 3/8 in NPT port, differential-pressure drain, 40 um element, no bracket, round gauge on the MPa scale, reverse/check valve fitted, and NPT thread.
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.