The AirTAC GFR400-15 AirTAC Filter Regulator G1/2 Low-Pressure 5 um 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 size-400 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in one body. This configuration is the low-pressure type (code L) with 5 um filtration (code W), a differential-pressure drain, a reverse/check valve (code K), an external round gauge on the psi scale, and a G1/2 (BSPP) port with G thread. A 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. The bowl on this size is polycarbonate (PC).
This is a genuine AirTAC part. The GFR family is published in sizes 200, 300, 400 and 600, with port options from 1/8 to 1 inch, a choice of differential-pressure, automatic or manual drain, 40 um standard or 5 um filtration, standard or low-pressure regulation, gauge and thread options, and an optional reverse/check valve. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request.
| Model | GFR400-15 AirTAC Filter Regulator G1/2 Low-Pressure 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT1/2" (G (BSPP) 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, psi 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. |
|---|---|
| 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. |
| 2 | Gauge scale: psi. 1 is MPa, 2 is psi, 3 is bar. |
| W | Filtering grade 5 µm. Only 40 µm (blank) and 5 µm (W) exist. |
| G | G (BSPP) 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 · PT1/2" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-15 (two-unit set) |
Feeds valve manifolds on process and packaging lines that hold actuators at low regulated pressure, with 5 um filtration protecting spools and seats and the check valve holding the circuit if supply dips.
Supplies filtered, low-pressure air to heat-seal and clamping frames on bagging and wrapping lines, where the psi gauge lets operators verify set pressure at the machine.
Conditions and regulates the drop line feeding air tools and fixtures in a machining or assembly cell, with the 1/2 inch port matching main drops and the differential drain keeping the bowl clear during production.
Size 400 with a 1/2 inch port suits lines with substantial air demand; step down to 300 or up to 600 if your flow curve and piping call for it. This unit is the low-pressure type, intended where the regulated output must sit well below standard settings; the exact range for the L type is not published, so confirm it with us. Filtration is 5 um here (code W) instead of the 40 um standard - choose 5 um where downstream valves, cylinders or instruments are sensitive to finer particles. The differential-pressure drain bleeds the bowl automatically as flow passes; an automatic (A) or manual (M) drain can be ordered instead. The round gauge on the psi scale is fitted; embedded square gauges and MPa or bar scales are alternatives. Thread is G (BSPP); PT is the standard catalogue thread and NPT is also orderable. A bracket is included. Flow is published as curves, not a single rating, so 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 GFR400 flow as performance curves rather than a single rated figure, so no single flow number can be quoted here. Tell us your line pressure, downstream demand and allowable pressure drop, and we will confirm the flow figures from the datasheet for this exact configuration before you order.
Code L makes this a low-pressure regulator type, intended for applications where the regulated output must be set lower than the standard type covers; the exact range for the L type is not published, so confirm it with us. Drain is differential-pressure (the default): the bowl drains itself as air flows through, with no operator action needed. Maximum inlet pressure is 1.0 MPa (145 psi) and the temperature range is -5 to 70 C, non-freezing.
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.