The AirTAC GFR400-15 AirTAC Filter Regulator, NPT 1/2 in, Low Pressure 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 GFR400-15 is a size 400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration has 1/2 in NPT ports, a 40 um standard filter element, a manual drain on the PC (polycarbonate) bowl, and the embedded square gauge fitted with a bar scale. It is the low-pressure regulator type, and no mounting bracket is included. 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 series is offered in sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, and with choices of drain type, filter grade (40 um standard, 5 um optional), gauge scale and thread (PT standard, G and NPT to order). Flow is published as curves rather than a single rating, so ask us to confirm datasheet figures for your application before you order.
| Model | GFR400-15 AirTAC Filter Regulator, NPT 1/2 in, Low Pressure |
|---|---|
| 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. |
| J | Supplied without bracket. |
| (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) |
On a machining centre with pneumatic clamps, this unit cleans the supply of water and swarf-carrying condensate and holds a steady low clamping pressure at the fixture, with the bar gauge giving the operator a direct reading at the station.
Feeding carton-sealing and case-forming cylinders on a packaging line, the filter section keeps moisture out of the valves while the regulator holds the gentle, consistent pressure these actuators need, and the manual drain is emptied during scheduled line stops.
At a manual assembly bench running air tools and small cylinders, this 1/2 in filter regulator conditions the drop line, protecting downstream equipment from water and dirt while keeping working pressure stable across the shift.
Pick the size and port step against the air demand of the circuit - the 400 size here takes a 1/2 in NPT connection. Drain choice matters: this unit has a manual drain, so the bowl must be drained by hand at intervals; automatic and differential-pressure drains are available elsewhere in the series if you want unattended drainage. The 40 um element is the standard grade (5 um is the W option), the square gauge is fitted with a bar scale, and thread options are PT (standard), G or NPT. Flow is published as curves, not 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 rather than a single rated figure, so we do not quote one number. Send us your air demand and operating pressure and we will confirm from the AirTAC datasheet whether this 1/2 in size 400 unit is correctly sized for your application.
The M in the code GFR400-15MLJF3T specifies a manual drain: the PC bowl must be drained by hand at intervals. If you would rather not do this, the GFR series is also available with an automatic drain (code A) or the differential-pressure drain that is the series default - just ask for the alternative model 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.