The AirTAC GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, 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 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 GFR400-10 is a size 400 filter regulator: filtration (water and particulate removal) and pressure regulation combined in a single body. This configuration carries an NPT 3/8 in port, the fine 5 um filter element (code W), and the low-pressure regulator type for circuits that run below standard working pressures. The differential-pressure drain bleeds accumulated condensate automatically as the pressure differential across the element changes, so there is no manual drain routine. The embedded square gauge is fitted and reads in psi, and the reverse/check valve (code K) holds downstream pressure if the upstream supply is interrupted. No mounting bracket is included with this code (J).
This is a genuine AirTAC part. The GFR family spans sizes 200, 300, 400 and 600 with port sizes from 1/8 in to 1 in, a choice of 40 um standard or 5 um fine filtration, differential-pressure, automatic or manual drains, gauge scales in MPa, psi or bar, and PT, G or NPT threads. Flow for this unit is published as curves rather than a single rated figure; ask us and we will confirm the datasheet figures for your application.
| Model | GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, 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 | 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 — square, 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. |
|---|---|
| 10 | Port size PT3/8". 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. |
| J | Supplied without bracket. |
| (blank) | Pressure gauge fitted (blank). |
| F | Gauge shape: Square. 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. |
| 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) |
Fixture clamps and swing cylinders that are specified to run below standard line pressure get both clean, moisture-reduced air from the 5 um element and a stable regulated supply from the low-pressure regulator, with the check valve holding the clamp position if the main supply drops.
Pneumatically piloted process valves need dry, particle-free pilot air at a controlled low pressure. This unit filters water and particulate down to 5 um and regulates the pilot circuit, while the psi gauge gives operators a direct local reading.
Test benches and analytical instruments with pneumatic components are sensitive to water and fine particles. The 5 um element and differential-pressure drain keep the supply clean without daily drain checks, and the regulator holds the low working pressure the instruments require.
Start with the port step: this unit is size 400 with a 3/8 in NPT thread, one step above the 1/4 in size 300. Match the size to the air demand of the circuit rather than to the pipe alone, and let us confirm the flow curve against your consumption before you order. On filtration, 40 um is the standard element and 5 um (this code, W) suits finer downstream equipment; the drain here is differential-pressure, but automatic (A) and manual (M) versions exist if your maintenance routine prefers them. The gauge is the embedded square type reading psi; MPa and bar scales and an external round gauge are alternatives. Thread is NPT here; PT is the catalogue standard and G (BSPP) is also orderable. This code omits the mounting bracket, which can be added on other codes.
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 series as curves, not as a single rated number, so we do not quote a l/min or SCFM figure here. Send us your line pressure and air consumption and we will confirm the datasheet curve and correct size for your application before you order.
The L code means this GFR400-10 carries the low-pressure regulator type, intended for circuits that operate below the standard regulator range; the exact range for this type is not published in the catalogue, so ask us to confirm it against your working pressure. The K code adds a reverse/check valve, which prevents downstream air from flowing back toward the regulator if the upstream supply is lost.
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.