The AirTAC GFR400-15 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 GFR400-15 is a size-400 filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is built with a 1/2 in NPT port, a 5 um filter element (the finer of the two catalogue grades), a manual drain on the PC bowl, a low-pressure regulator type, an embedded square gauge scaled in MPa, and no mounting bracket. The low-pressure type is intended where the working set point sits below the range of the standard unit; the exact adjustment range for this variant is not published, so we confirm it against the datasheet on request.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drain, 40 um or 5 um filtration, gauge and thread options, and an optional bracket. Flow is published as curves rather than a single rated figure, so ask us to confirm sizing and datasheet figures for your application before ordering.
| Model | GFR400-15 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, 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. 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. |
| J | Supplied without bracket. |
| (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) |
Fixture clamps and swing cylinders on a CNC cell often hold best at a set point well below full line pressure. The GFR400-15 filters the supply to 5 um and holds a low regulated pressure so clamping force stays repeatable, with the MPa gauge giving the operator a direct set-point readout.
Packaging machinery runs many small cylinders and air jets that are sensitive to water carry-over and pressure drift. A 1/2 in filter regulator with a 5 um element conditions the drop ahead of the line, the manual drain serves scheduled end-of-shift blowdown, and the square gauge keeps the header set point visible.
Analytical instruments, test rigs and pneumatic lab benches need clean, dry air at a stable, moderate pressure. The 5 um element protects sensitive components from particulate, the low-pressure regulator type suits reduced set points, and the 1/2 in NPT port ties neatly into a bench supply header.
Start with the port step: size 400 with a 1/2 in NPT port suits lines plumbed at 1/2 in, but the right size is ultimately set by the flow your circuit needs. Because AirTAC publishes flow as curves rather than a single rating, send us your air demand and we will confirm the correct size against the datasheet before you order. Drain type is a real choice here: this unit has a manual drain, which you open by hand during checks; automatic or differential-pressure drains are available in the family if you prefer not to rely on manual attention. Filtration is set by the element: this unit carries the 5 um (W) grade for finer particle removal, while 40 um is the standard alternative. The embedded square gauge on this unit is scaled in MPa; psi and bar scales and an external round gauge are options. Thread: PT is the AirTAC standard, with G (BSPP) and NPT as catalogue options - this unit is ordered with NPT. Bracket: this configuration omits the mounting bracket (code J); a bracketed version is available. Max inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing.
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 rather than a single rated figure, so we do not quote one number. Tell us your application's air consumption and line pressure and we will confirm against the datasheet whether the size-400, 1/2 in port unit is correctly sized before you order.
This configuration is ordered with a manual drain (code M): the PC bowl is drained by hand as part of routine maintenance. The GFR family also offers an automatic drain (A) and a differential-pressure drain (the default) if you want condensate removal without manual attention - just ask for the equivalent code.
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.