The AirTAC GFR40015MLF3WT AirTAC Filter Regulator NPT1/2 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 PT1/2" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 130 psi). It does not lubricate — add a GL lubricator, or order the GFC two-unit set, if downstream equipment needs oil.
The AirTAC GFR40015MLF3WT is a size-400 GFR filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built for a 1/2 in NPT port, carries the fine 5 um filtration element (the W grade, one step finer than the 40 um standard), drains by hand through its manual drain, and is the low-pressure regulator type with an embedded square gauge scaled in bar. The polycarbonate bowl lets you see accumulated condensate at a glance, and the mounting bracket is included.
This is a genuine AirTAC part from the GFR range, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of PT (standard), G or NPT threads, manual, automatic or differential-pressure drains, 40 um or 5 um filtration, and gauge or no-gauge variants. Flow is published as curves rather than a single rating, so ask us to confirm the datasheet and sizing figures for your application before ordering.
| Model | GFR40015MLF3WT AirTAC Filter Regulator NPT1/2 Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, bar scale |
| Reflux valve | Not fitted |
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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| (blank) | No reverse-flow valve (the default). |
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) |
Feeds filtered, regulated air to the clamp cylinders on a CNC fixture, with the 5 um element protecting the clamping valves from particulate and the manual drain cleared at shift checks.
Conditions the supply to the air cylinders that place cartons on a packaging conveyor, with the square bar gauge giving operators a visible setpoint at the machine.
Sits at the drop to a coating line, taking water and fine particles out of the air feeding spray equipment while the low-pressure regulator type holds a reduced working pressure.
Step up or down through the GFR sizes (200/300/400/600) so the port and body match the flow your line needs - this unit is the 400 size with a 1/2 in NPT port. Choose the 5 um element (this code) when downstream valves, cylinders or instruments need finer air than the 40 um standard. Manual drain (this code) means an operator drains the bowl on a schedule; choose automatic or differential-pressure drain codes if the unit will sit where nobody opens the bowl. The embedded square gauge here is scaled in bar; MPa and psi scales and an external round gauge are alternatives. PT is the standard thread, with G and NPT as order options - this code is NPT. The low-pressure regulator type suits circuits set well below standard line pressure; ask us to confirm its exact adjustment range. A bracket is included with this code.
One honest note on sizing: AirTAC publishes flow as curves, not a single rated figure, so send us your application details and we will confirm the right size against the datasheet before you order.
Quick checklist
The PC bowl must not be cleaned with solvents — wipe it with a dry cloth. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR400 series as curves rather than a single rated figure, so there is no one l/min or SCFM number we can honestly quote. Tell us your application and line pressure and we will confirm the sizing against the datasheet on request before you order.
The M in the code selects the manual drain: an operator opens the bowl drain to release collected condensate. It suits units mounted where they are checked regularly. If the regulator will sit unattended, the automatic or differential-pressure drain codes in the same GFR400-15 family empty the bowl without hands-on attention.
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.