The AirTAC AirTAC GFR400-10 Filter Regulator 3/8in NPT, 5um, Bar Gauge 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 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 is threaded 3/8in NPT and is built in the low-pressure regulation type, so it suits circuits that hold a lower working pressure than a standard regulator is set up for; the exact adjustment range is confirmed on request. It carries the fine 5 um filter element (code W), a manual drain bowl in polycarbonate, an embedded square gauge scaled in bar, a reverse/check valve, and a mounting bracket.
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with ports from 1/8in to 1in, a choice of differential-pressure, automatic or manual drains, 40 um standard or 5 um fine filtration, gauge scale options, and PT, G or NPT threads. Flow is published as curves rather than a single rating, so we confirm the datasheet and sizing figures for your application on request.
| Model | AirTAC GFR400-10 Filter Regulator 3/8in NPT, 5um, Bar Gauge |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (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, bar scale |
| Reflux valve | Fitted (reverse flow permitted) |
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. |
| (blank) | Mounting bracket included. |
| (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. |
| 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. |
| K | Reverse-flow (reflux) valve fitted. |
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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Air-prep point for clamp cylinders on a CNC fixture: the 5 um element keeps water and chips-carrying condensate out of the clamp valves while the low-pressure regulator holds the clamping circuit at its set pressure.
Feeding a valve manifold on a cartoning or wrapping line: the filter-regulator cleans and regulates the supply ahead of the valves, the bar gauge gives the operator a local pressure readout, and the check valve holds the setting against backflow.
Conditioning the air feed to spraying or coating equipment that runs at reduced pressure: the low-pressure regulation type, fine 5 um filtration and manual drain suit a supervised booth where an operator checks the bowl at shift start.
Start with the port step: this unit is size 400 with a 3/8in NPT thread; step up or down through the 200/300/400/600 sizes to match the air demand of the circuit. Choose the drain: this configuration is manual (code M), meaning someone opens the drain periodically; automatic or differential-pressure versions drain themselves. The 5 um element (W) is the finer choice over the 40 um standard element where downstream valves and cylinders need cleaner air. The square gauge here reads in bar; MPa and psi scales are available, and an external round gauge is optional. Thread is NPT here; PT (standard) and G are order options, and a no-bracket variant exists for other GFR codes. Because 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for the GFR400 as performance curves, not as a single rated number, so we do not quote a figure here. Tell us your application and we will confirm the flow and sizing data from the datasheet on request before you order.
Manual drain (code M) means the collected water is released by opening the drain when needed, rather than by an automatic mechanism. It suits supervised installations where an operator can check the bowl routinely. With a manual drain the regulation range differs from the automatic and differential-pressure versions, and the exact range for this low-pressure type is confirmed on request.
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.