The AirTAC GFR400-10 NPT AirTAC Filter Regulator, 3/8 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 PT3/8" 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 GFR400-10 is a filter regulator: one body that removes water and particulate from compressed air and then regulates downstream pressure. This size 400 unit takes a 3/8 in NPT port, carries the low-pressure regulator type, has a manual drain on its polycarbonate bowl, a 40 um standard filter element, and an embedded square gauge reading in bar. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). No mounting bracket is fitted.
This is a genuine AirTAC part. The GFR family is offered in sizes 200, 300, 400 and 600 with ports from 1/8 to 1 inch, a choice of manual, automatic or differential-pressure drains, 40 um or 5 um (W) filtration, gauge scales in MPa, psi or bar, and PT, G or NPT threads. Rated flow is published as curves rather than a single figure, so we confirm datasheet numbers on request.
| Model | GFR400-10 NPT AirTAC Filter Regulator, 3/8 in, Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (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. |
|---|---|
| 10 | Port size PT3/8". 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 · PT3/8" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Cleaning and stepping air down to a stable, lower pressure before it reaches the weld-gun clamping actuators on a robotic spot-welding cell, where the low-pressure regulation band matches the setpoint the grippers need.
Filtering plant air and holding a reduced, steady pressure on the drop feeding the pneumatic reject and capping actuators on a bottling line, with the bar gauge letting line staff verify the setpoint at a glance.
Conditioning supply air to a hydraulic-free clamping fixture on a CNC machining centre, where the 40 um element protects the clamp cylinders and the regulator holds the clamping pressure the fixture was designed around.
Size 400 with a 3/8 in NPT port suits lines that need more capacity than the 200/300 sizes; step up to 600 or down to 300 as your air demand changes. The manual drain here means an operator opens the bowl drain during checks - choose the automatic (A) or differential-pressure (blank) version if you cannot visit the unit regularly. Filtration is the 40 um standard element; specify W for the 5 um grade where finer protection matters. This is the low-pressure regulator type; its adjustment range is not published, so confirm it against your set pressure before ordering. The embedded square gauge reads in bar, with MPa and psi scales available as options, and PT is the standard thread with G and NPT as order options. A bracket can be ordered if you need one. Flow is published as curves, not a single rating - 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.
Flow for this unit is published as curves in the AirTAC datasheet rather than as a single rated figure, so we do not quote a number here. Send us your line pressure, set pressure and air demand and we will confirm the sizing from the datasheet on request.
The M in this code selects the manual drain: an operator opens the bowl drain during maintenance rounds. If the unit sits somewhere hard to reach, order the automatic (A) or differential-pressure (blank) drain version instead - it is the same filter regulator with a different drain.
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.