The AirTAC GFR40015LF3WTK AirTAC Filter Regulator 1/2 in NPT 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 PT1/2" 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 GFR400-15LF3WTK 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 for 1/2 in NPT ports, is the low-pressure type, carries the fine 5 um filter element (code W), drains condensate by differential pressure, and is fitted with the embedded square pressure gauge scaled in bar. The K code adds a reverse (check) valve, and the mounting bracket is included. The polycarbonate bowl lets you see the condensate level at a glance.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of drain types, 40 um or 5 um filtration, gauge scales in MPa, psi or bar, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR40015LF3WTK AirTAC Filter Regulator 1/2 in NPT |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (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, 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. |
|---|---|
| 15 | Port size PT1/2". 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. |
| 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
On a machining-fixture line where clamps are held at reduced working pressure, this low-pressure type filter regulator sets and holds the clamp circuit pressure while the 5 um element protects the clamping valves from scale and pipe debris.
Feeding cylinders and diverters on a carton-packaging conveyor, the unit cleans and regulates the plant air at the machine drop, the differential-pressure drain keeps condensate off the cylinders, and the check valve holds the circuit if the main supply drops.
At a laboratory or test-bench air drop serving sensitive pneumatic instruments, the 5 um filtration strips fine particulate and water carryover, the bar-scaled gauge gives a clear set-point readout, and the bracket mounts the unit neatly at the panel.
Choose the size 400 / 1/2 in NPT step when your line's air consumption sits in the upper mid-range; larger sizes carry larger ports and more flow, and the published flow curves - not a single rating - are the honest basis for sizing, so send us your demand and we will confirm the fit. This unit is the low-pressure type, selected where the working circuit runs below standard regulator settings; the exact adjustment range for the low-pressure version is not published, and we confirm it on request. The 5 um element (W) suits actuating valves and instruments that need finer air than the 40 um standard; the differential-pressure drain bleeds condensate automatically as flow passes through, with no manual draining routine. The square gauge is scaled in bar; MPa, psi and round-gauge options exist across the series. NPT is the thread here, with PT and G available as order options, and the bracket is included for panel or wall mounting.
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 l/min or SCFM figure. Send us your application's air demand and line pressure and we will confirm the correct size against the datasheet curves before you order.
K means a reverse (check) valve is fitted, so downstream pressure is held if the upstream supply is lost. This unit has no drain letter, which is the differential-pressure drain: condensate is discharged automatically as air flows through, with no manual draining needed. A manual-drain (M) or automatic-drain (A) version can be ordered instead if your duty cycle suits it better.
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.