The AirTAC GFR40015MLF3T AirTAC Filter Regulator NPT1/2 Bar Gauge 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 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 GFR40015MLF3T is a size 400 filter regulator: water and particulate filtration plus pressure regulation combined in a single body, with a 1/2 in NPT port. This configuration is the low-pressure regulator type with a manual drain bowl, a 40 um standard filter element, an embedded square gauge scaled in bar, and a mounting bracket included. The bowl on this size is polycarbonate (PC). It runs on compressed air only, at a maximum inlet pressure of 1.0 MPa (145 psi) and a temperature range of -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in, G (BSPP) and NPT thread variants alongside the PT standard, differential-pressure, automatic or manual drains, a 5 um (code W) filter element option, gauge scale choices, and a reverse/check valve option. Flow figures are published as curves rather than a single rating, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR40015MLF3T AirTAC Filter Regulator NPT1/2 Bar Gauge |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (NPT thread) |
| Filtering grade | 40 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. |
| (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. |
| (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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
Fixture clamps and hold-down cylinders that are specified to run at reduced set pressures get both clean, moisture-reduced air and a stable regulated supply from one body, with the bar-scaled square gauge giving the operator a direct pressure readout at the fixture.
Packaging lines with sensitive actuator sections benefit from a single filter regulator feeding the section: the 40 um element keeps debris out of directional valves and cylinders, the manual drain lets maintenance bleed accumulated condensate during scheduled changeovers, and the 1/2 in NPT port suits the main drop to the machine.
Instrument air branches feeding pneumatic valve positioners and actuators in a process plant need filtered air held at a modest, steady set pressure; this low-pressure type filter regulator mounted at the branch takeoff, bracket-fixed beside the line, provides that conditioning in one unit.
Start with the port step: this unit is size 400 with a 1/2 in NPT port; smaller sizes 200/300 step down to 1/8-3/8 in and size 600 steps up to 1 in, so match the size to the air demand of the circuit. Drain choice matters: this model has a manual drain, which suits installations where an operator can bleed the bowl on a schedule; automatic and differential-pressure drains are available in the family for unattended drops. The 40 um element is the standard grade; specify the 5 um W variant if downstream equipment needs finer filtration. The embedded square gauge here reads in bar; MPa and psi scales and an external round gauge are alternatives. PT is the standard thread and G (BSPP) or NPT are order options - this unit is ordered in NPT. A bracket is included; a no-bracket (J) version exists. Because flow is published as curves rather than a single rated figure, 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. 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 GFR series as curves, not as a single rated number, so we do not quote a figure that could mislead your sizing. Send us your application details and we will confirm the relevant flow-curve and datasheet figures for this 1/2 in NPT size 400 unit on request.
The M in the code specifies a manual drain bowl: condensate collected by the 40 um filtration stage is released by operating the drain by hand. Choose manual drain where the unit is accessible and your maintenance routine includes regular bowl bleeding; the GFR family also offers automatic and differential-pressure drains for installations that cannot be attended on a schedule.
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.