The AirTAC AirTAC GFR400-10 Filter Regulator, 3/8 in NPT, 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 PT3/8" ports, a automatic 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 GFR400-10ANWTK is a filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is the 400 size with a 3/8 in NPT port, a 5 um filtration element (the finer of the two catalogue grades), an automatic drain that expels collected condensate without manual attention, and a built-in reverse/check valve that holds downstream pressure when the supply is interrupted. No gauge is fitted, so add a separate gauge if visual pressure indication is needed. Maximum inlet pressure is 1.0 MPa (145 psi), the standard regulation range is 0.15-0.9 MPa (20-130 psi), and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits this size; only the 600 size uses an aluminium alloy bowl.
This is a genuine AirTAC part supplied by airdistribution distributor airtacdistr.com for the US market. The GFR family spans the 200, 300, 400 and 600 sizes with 1/8 in to 1 in ports, manual, automatic or differential-pressure drains, 40 um or 5 um elements, gauge and bracket options, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet and flow figures for your application before ordering.
| Model | AirTAC GFR400-10 Filter Regulator, 3/8 in NPT, 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 µm |
| Regulating range | 0.15 - 0.9 MPa (20 - 130 psi) |
| Pressure type | Standard 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 | Automatic drain |
| Bowl material | PC |
| Pressure gauge | Not fitted |
| 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. Standard type, regulating 0.15 - 0.9 MPa (20 - 130 psi). 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". |
| A | Drain: Automatic drain — this also sets the regulating band (0.15 - 0.9 MPa (20 - 130 psi)). |
| (blank) | Standard type. Blank is standard, L is the low-pressure type. |
| (blank) | Mounting bracket included. |
| N | No pressure gauge (N). |
| (blank) | Gauge shape: Factory standard. C is round, F is square. |
| (blank) | Gauge scale: Factory standard. 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) |
Feeding filtered, regulated air to a workshop press station: the 5 um element protects the press cylinder valve from particulate and water, the regulator holds a steady working pressure, and the check valve keeps the circuit pressurised through brief supply dips.
Conditioning air for conveyor-mounted packaging actuators and clamps: the automatic drain handles condensate on a line that runs unattended across shifts, and the 3/8 in NPT port matches typical machine drop piping.
Preparing air for laboratory or test-bench pneumatic instruments that tolerate little moisture or dirt: the 5 um grade polishes the supply, the regulator sets a stable low working pressure, and the bracket fixes the unit to the bench frame.
Choose the GFR400 size when your line runs at 3/8 in porting and you want filter and regulator combined in one body instead of two separate components. The 5 um element in this code is the finer option for air that feeds sensitive valves, cylinders or instruments; the 40 um standard grade is the usual choice for general plant air. The automatic drain here suits unattended or hard-to-reach installations; a manual drain is fine where an operator passes regularly, and the differential-pressure drain is the catalogue default. The built-in check valve holds set pressure through supply drops - useful on circuits that must not lose position. This unit carries no gauge, so plan external indication if operators need to read the set pressure. NPT is ordered as a thread option; PT is the catalogue standard and G (BSPP) is also available. Bracket is included for panel or wall fixing.
One honest note on sizing: AirTAC publishes flow for this family as curves, not as a single rated number, so we will not quote you a flow figure from memory. Send us your required flow and working pressure and we will confirm against the datasheet that the 400 size is right before you order.
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 GFR family as performance curves rather than a single rated figure, so we do not quote a rated flow number. Send us your required flow and working pressure and we will confirm against the datasheet whether the 400 size at 3/8 in NPT suits your application before you order.
The N in the code means no gauge is fitted, so you will need a separate gauge if operators must read the set pressure. The K means a reverse/check valve is built in: it holds downstream pressure if the air supply is interrupted. The A means automatic drain, and W is the 5 um filter element.
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.