The AirTAC GFR40010ALF3WTK 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 automatic 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 GFR40010ALF3WTK is an AirTAC GFR400 filter regulator: water and particulate filtration plus pressure regulation combined in a single body. This configuration is built with a 3/8 in NPT port, a 5 um filter element for finer air cleaning than the standard 40 um grade, an automatic drain that expels collected condensate without manual attention, and a reverse/check valve that holds the downstream setting when upstream pressure is lost. It is the low-pressure type, intended for circuits that operate at reduced set pressures, and the embedded square gauge reads in bar so the set point is visible at the unit.
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 series you can order manual or differential-pressure drains, the 40 um standard element, alternative gauge scales, and PT or G threads instead of NPT. Flow is published as curves rather than a single rating, so send us your application and we will confirm the sizing and datasheet figures on request.
| Model | GFR40010ALF3WTK 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 | Automatic 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". |
| A | Drain: Automatic 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. |
| 3 | Gauge scale: bar. 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 a machine-tool press line with NPT-plumbed air drops, this unit filters the supply to 5 um, holds a low set pressure on the clamping circuit, and the check valve keeps clamps from releasing during an upstream pressure dip.
Packaging machines with 3/8 in air feeds use this filter regulator to remove water and fine particles before cylinders and diverters, while the automatic drain handles condensate on lines that run all shift without an operator.
Test rigs and lab benches needing clean, finely adjusted low-pressure air use the 5 um element and bar-scale gauge for repeatable settings, with the check valve protecting the bench from supply-side pressure loss.
Size and port are the first choice: the 400 series with a 3/8 in port sits in the middle of the GFR range, and the right step depends on the air demand of the circuit - ask us to check the published flow curves against your consumption before ordering. Drain type is a real decision: automatic (as fitted here) suits unattended duty, manual suits periodic checks, and differential-pressure draining is the default. Filter grade is 40 um standard or 5 um (code W) where finer cleaning is needed; this unit carries the 5 um element. The square gauge is fitted with a bar scale, and MPa or psi scales are available as alternatives. Thread is NPT here, with PT as the standard and G as an order option. A mounting bracket is included. Note that this is the low-pressure regulator type - confirm the exact adjustment range with us, as it is not published in the standard tables.
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 GFR400 flow as performance curves rather than a single rated figure, so there is no one number we can quote honestly. Send us your line pressure, set pressure and air consumption, and we will confirm the sizing against the datasheet curves on request before you order.
The code decodes it that way: A is the automatic drain, which ejects collected condensate on its own instead of waiting for a manual bleed, and W is the 5 um filter grade, one step finer than the 40 um standard. If your circuit can tolerate coarser filtration or you prefer a manual or differential-pressure drain, other GFR400 variants are available to order.
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.