The AirTAC GFR40010LF1WTK AirTAC Filter Regulator NPT3/8 Low-Pressure is a genuine G-series filter regulator: water separation, 5 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 GFR40010LF1WTK is a size 400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built with a 3/8 in NPT port, a fine 5 um filter element (the 40 um standard element is the alternate choice), a differential-pressure drain that bleeds collected condensate automatically as flow passes through, and the low-pressure (L) regulator type for circuits that run at reduced set pressures. A square pressure gauge scaled in MPa is fitted, a reverse/check valve is included to hold downstream pressure, and a mounting bracket is supplied for panel or frame mounting.
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in, PT as the standard thread and G or NPT as order options, a choice of 40 um or 5 um filtration, differential-pressure, automatic or manual drains, and gauge or no-gauge variants. Flow is published as curves rather than a single rated figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR40010LF1WTK AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 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. |
| W | Filtering grade 5 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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
On an assembly fixture where clamps must close at a reduced, controlled pressure rather than full line pressure, this low-pressure-type filter regulator cleans the supply, holds the set pressure with its check valve, and shows the setting on the fitted MPa gauge.
Feeding the air cylinders and actuators along a carton-forming or case-sealing conveyor, this unit strips water and fine particulate at 5 um, drains condensate differentially as air flows, and keeps the line pressure steady at the set point.
On a laboratory or QC test bench where sensitive pneumatic instruments need clean, finely filtered air at a stable reduced pressure, the 5 um element, low-pressure regulation and downstream check valve protect the circuit between test runs.
Size 400 with a 3/8 in NPT port sits in the middle of the GFR range: step up to size 600 or down to 300/200 depending on the flow your line needs, and confirm the step against the published flow curves before ordering. This unit carries the 5 um element (code W) - choose it when downstream valves, cylinders or instruments need finer filtration than the 40 um standard; the drain here is the differential-pressure type, with automatic and manual drains available as alternates. The L code makes this the low-pressure regulator type, intended for circuits running at reduced set pressures below the standard type's range; the exact low-pressure range is not published in our sheet, so confirm it with us. The fitted square gauge reads in MPa (psi and bar scales are order options), the K code adds a reverse/check valve, and the bracket is included. PT is the standard thread; G and NPT are catalogue options you order by suffix. Because flow is published as curves rather than a single rating, ask us to confirm sizing against your application 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 GFR flow as curves, not as a single rated number, so we do not quote a rated flow, Cv or SCFM figure for this unit. Send us your application details and we will confirm the datasheet flow curves and sizing on request before you order.
L marks the low-pressure regulator type, intended for circuits running at reduced set pressures rather than the standard type; the exact low-pressure range is not published on our sheet, so confirm it with us. The drain is the differential-pressure type: it bleeds collected condensate automatically as air flows through the bowl, with no manual draining needed, and automatic or manual drains are available as alternate order codes.
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.