The AirTAC GFR400-15 NPT AirTAC Filter Regulator 1/2 in 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 differential-pressure 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: it removes water and particulate from compressed air and holds downstream pressure steady, in one body. This 400-size unit is the low-pressure type, threaded NPT1/2, and carries the 5 um filter element (code W, against the 40 um standard). Condensate is handled by the differential-pressure drain, a round gauge scaled in bar is fitted, and a mounting bracket is included. The polycarbonate bowl gives a clear view of collected condensate. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. As a low-pressure type, its adjustment range is not published in the catalogue, so confirm it with us if your set-point is critical.
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 drain, 40 um or 5 um filtration, standard or low-pressure regulation, embedded square or external round gauges scaled in MPa, psi or bar, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so ask us to confirm figures from the datasheet for your application before ordering.
| Model | GFR400-15 NPT AirTAC Filter Regulator 1/2 in Low-Pressure |
|---|---|
| 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 | Differential-pressure drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, 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". |
| (blank) | Drain: Differential-pressure 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). |
| C | Gauge shape: Round. 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) |
On a beverage bottling line, this unit filters water and particles out of the shop air and holds a steady lower working pressure to the pick-and-place grippers and clamp cylinders, with the 5 um element protecting the small control valves downstream.
At a spray-booth station, the low-pressure regulator keeps atomising air at a gentle, repeatable setting while the 5 um grade and water removal help keep moisture and debris out of the air line feeding the spray gun.
On a carton-packaging conveyor, this filter regulator supplies the diverter and stopper cylinders with cleaned air held at a stable low pressure, so sorting strokes stay consistent shift after shift; the bracket simplifies mounting at the machine frame.
Size the unit by port and required flow: the 400 size with its 1/2 in NPT port sits above the 300 and below the 600 in the GFR range. This configuration is the low-pressure type (code L), so choose it where the working pressure stays in the lower band; the exact adjustment range is not published, so confirm it with us. The 5 um element (code W) gives finer filtration than the 40 um standard. The drain here is differential-pressure, which passes condensate automatically as pressure across it drops; automatic and manual drains are the other family options. The fitted round gauge reads in bar; embedded square gauges and MPa or psi scales are the alternatives. PT is the standard thread, with G and NPT as order options - this unit is ordered in NPT. A mounting bracket is included. 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 figure, so we do not quote a number on the page. Tell us your application, working pressure and connected load, and we will confirm the flow figures from the datasheet for you before you order.
It marks the low-pressure type of regulator. This unit is intended for applications where the set pressure sits in the lower band rather than the full standard range. The exact adjustment range for the low-pressure type is not published in the catalogue, so ask us to confirm it against your set-point before ordering.
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.