The AirTAC GFR400-10 AirTAC Filter Regulator NPT3/8 Low-Pressure 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 400-size filter regulator that removes water and particulate from compressed air and regulates downstream pressure in a single body. This configuration is ordered with NPT3/8 ports, the fine 5 um filter element (code W) instead of the standard 40 um, a differential-pressure drain, low-pressure regulation, a round external gauge scaled in psi, and a built-in reverse/check valve; no mounting bracket is included. Maximum inlet pressure is 1.0 MPa (145 psi) and the operating temperature range is -5 to 70 C (non-freezing). The polycarbonate bowl suits the 400 size, and the differential-pressure drain bleeds accumulated condensate automatically whenever the pressure differential across the element is high enough.
This is a genuine AirTAC part from the GFR series, which spans sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 inch, manual, automatic or differential-pressure drains, 40 um or 5 um filtration, square or round gauges in MPa, psi or bar scales, and optional check valves. Flow figures for this series are published as curves rather than a single rated value, so ask us to confirm the datasheet and sizing for your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator NPT3/8 Low-Pressure |
|---|---|
| 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 — 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. |
|---|---|
| 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). |
| 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. |
| 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) |
Feeds filtered, pressure-regulated air to a bench-mounted pneumatic press cell, where the 5 um element protects the press valve from fine particulate and the psi gauge lets operators verify set pressure at a glance.
Supplies conditioned air to conveyor diverters, stop gates and pusher cylinders in a packaging or sorting line, with the check valve holding the downstream circuit against backflow and the low-pressure regulator suiting gentle-actuation settings.
Conditions the compressed air feeding laboratory test rigs and pilot-scale process benches, where the 5 um grade, psi-scaled gauge and regulated low-pressure output give repeatable, visibly monitored air to sensitive fixtures.
Choose the 400 size with NPT3/8 ports when your line runs at 3/8 inch piping and your flow demand sits above what the 300 size comfortably serves; step up to 600 or down to 300 as your circuit requires. This unit carries the 5 um element (code W) - pick it when downstream valves, cylinders or instruments need finer filtration than the standard 40 um element provides. The differential-pressure drain is the default: it discharges condensate automatically on pressure differential, whereas code A gives a fully automatic drain and code M a manual twist drain. The round gauge here is scaled in psi; square embedded gauges and MPa or bar scales are alternatives. Thread is NPT on this unit (code T); PT is the standard thread and G (BSPP) is also an order option, and code J means no mounting bracket is supplied. The low-pressure regulator type suits circuits set below the standard range - its exact adjustment range is not published, so confirm it with us. Flow for this series 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 flow for the GFR series as performance curves rather than a single rated figure, so we do not quote a rated l/min, m3/h or SCFM number. Tell us your application and we will confirm the flow data from the datasheet and check the 400 size against your requirement before you order.
Code L orders the low-pressure regulator type, intended for circuits set below the standard adjustment range; the exact range for this type is not published, so we confirm it on request. Code K fits a reverse/check valve, which prevents downstream air from flowing back through the unit. This configuration also carries the 5 um element instead of the standard 40 um, a round psi gauge, a differential-pressure drain and no mounting bracket.
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.