The AirTAC GFR400-15 AirTAC Filter Regulator NPT1/2, 5 um, Auto Drain 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 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 GFR400-15 is an AirTAC GFR-series filter regulator: water and particulate filtration plus pressure regulation combined in a single body. This size 400 unit carries a 1/2 in NPT port, a fine 5 um filter element (the W grade, versus the standard 40 um), an automatic drain that expels collected condensate without manual attention, and the low-pressure regulator type. It ships with the embedded square gauge reading in psi, includes a mounting bracket, and the polycarbonate bowl lets you see the condensate level at a glance. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8 to 1 in, a choice of differential-pressure, automatic or manual drains, 40 um or 5 um filtration, standard or low-pressure regulation, square or external round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow figures are published as curves rather than a single rating, so ask us to confirm the datasheet and sizing for your application.
| Model | GFR400-15 AirTAC Filter Regulator NPT1/2, 5 um, Auto Drain |
|---|---|
| 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Fitted — square, psi 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". |
| 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. |
| 2 | Gauge scale: psi. 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) |
Feeding filtered, regulated air to the tool-clamp and chuck-actuation circuits of a CNC machining centre, where the 5 um element protects precision valves from particulate and the automatic drain keeps condensate off the machine frame.
Conditioning the air feeding the valve manifold on a carton-forming and sealing line, combining water removal and pressure control in one body to save panel space at the 1/2 in take-off point.
Supplying regulated air to the divertor gates and stopper cylinders along a warehouse conveyor line, where the automatic drain suits a distribution point that is not checked every shift.
Start with the port step: size 400 in 1/2 in suits lines where the required air demand sits above the 3/8 in class - match the size to your flow need rather than oversizing on pipe alone. This unit is already specified with the finer 5 um element (code W); choose 40 um where only coarse particulate and bulk water removal is needed, and 5 um where downstream valves and cylinders need cleaner air. Drain choice matters: automatic drain (fitted here) suits unmanned or hard-to-reach installations, manual drain suits attended stations, and the differential-pressure default triggers on a set pressure drop. The embedded square gauge reads in psi; MPa and bar scales and an external round gauge are alternatives. Thread is NPT here, with PT (standard) and G available to order; a bracket is included. Because AirTAC publishes flow 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 this series as curves, not a single rated figure, so we do not quote one number. Send us your application details - line pressure, downstream consumption and duty - and we will confirm the flow curve from the datasheet and check the sizing with you before you order.
The A in the code GFR40015ALF2WT specifies an automatic drain, which expels collected condensate by itself - useful for unmanned or hard-to-reach installations. The GFR family also offers a manual drain (code M) and a differential-pressure drain as the default, so you can order the drain type that matches how the station is operated.
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.