The AirTAC GFR400-15 NPT1/2 AirTAC Filter Regulator, 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 AirTAC GFR400-15 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure, so a single unit handles both jobs on a 1/2 inch line. This configuration is fitted with a 5 um filter element (the finer of the two published grades), an automatic drain that expels collected condensate from the polycarbonate bowl without manual attention, and an embedded square pressure gauge scaled in MPa. The standard regulator covers an adjustment range of 0.15-0.9 MPa (20-130 psi), maximum inlet pressure is 1.0 MPa (145 psi), and the unit carries an included mounting bracket. Operating temperature is -5 to 70 C (non-freezing).
This is a genuine AirTAC part in the GFR400 series. The GFR family is published in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, and with choices of drain type, filter grade, gauge style and scale, and thread form. Rated flow for this series is published as curves rather than a single figure, so ask us and we will confirm the datasheet figures for your application on request.
| Model | GFR400-15 NPT1/2 AirTAC Filter Regulator, 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 | Standard 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, MPa 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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)). |
| (blank) | Standard 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. |
| 1 | Gauge scale: MPa. 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 clean, regulated air to the tool-change clamps and pneumatic actuators on a CNC machining centre, with the 5 um element protecting fine-tolerance valve spools from particulate and the automatic drain keeping condensate out of the circuit on a 1/2 inch main.
Sits at the drop of a packaging line's air main to supply the diverter gates, bag sealers and counting cylinders, holding a steady regulated pressure so clamp forces and timing stay repeatable through the shift while the auto drain handles moisture carryover.
Prepares the air feeding rinse nozzles and cap-tightening heads on a bottling line, where the 5 um grade limits particulate at the point of use, the square MPa gauge gives operators a visible setpoint, and the automatic drain copes with humid compressor air.
Start with the port step: this unit is size 400 with a 1/2 inch NPT thread, so match it to the line size and the air demand of the equipment it feeds - if your demand sits near the top of a smaller size, step up. Because flow for the GFR series is published as curves rather than a single rated number, ask us to confirm sizing against your application before ordering. Then choose the drain: automatic (fitted here) empties the bowl unattended, manual drain needs an operator, and the differential-pressure default drains only when the pressure drop across the element rises. Filter grade is 40 um standard or 5 um (code W, fitted here) where finer particulate matters. Gauge options are the embedded square gauge (MPa fitted here, psi and bar scales available) or an external round gauge. PT is the standard thread; G (BSPP) and NPT are catalogue options to order, as is the no-bracket (J) variant.
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 figure, so we do not quote a number on the page. Send us your line pressure, set pressure and air demand, and we will confirm the datasheet flow figures for this 1/2 inch size against your application on request before you order.
The A in the code selects the automatic drain: collected condensate is expelled from the bowl without operator attention, which suits unattended or hard-to-reach installations. The catalogue alternatives are a manual drain (you drain it yourself) and the differential-pressure default (drains when the element's pressure drop rises). This unit also carries the 5 um element (code W) instead of the 40 um standard.
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.