The AirTAC AirTAC GFR400-10 Filter Regulator 3/8 in NPT, 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 filter regulator: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 400-size unit is fitted with 3/8 in NPT ports, the W-coded 5 um filter element for finer filtration than the standard 40 um grade, and a differential-pressure drain that bleeds condensate automatically as the pressure differential across the element rises. It is the low-pressure (L) regulator type, so it is intended for circuits that run below the standard regulator band; the exact adjustment range for this variant is confirmed on request. The embedded square gauge reads in bar, the polycarbonate bowl suits the 400 size, and the 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.
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 differential-pressure, automatic or manual drains, 40 um or 5 um filtration, square or optional round gauges with MPa, psi or bar scales, and PT, G or NPT threads. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request before you order.
| Model | AirTAC GFR400-10 Filter Regulator 3/8 in NPT, 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 — square, bar scale |
| Reflux valve | Not fitted |
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. |
| (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. |
| (blank) | No reverse-flow valve (the default). |
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 hold parts at reduced line pressure get both clean air and stable regulation from one GFR body, with the bar gauge giving the operator a direct setting reference.
Packaging lines with solenoid valve blocks benefit from the 5 um element keeping fine debris out of the valves, while the low-pressure regulator type holds the gentler supply pressure those circuits need.
Bench rigs and analytical instrument panels running at reduced pressure use the differential-pressure drain to shed condensate without opening the enclosure, and the 5 um grade to protect sensitive pneumatic controls.
Start with the port step: this unit is size 400 with 3/8 in NPT ports; step up or down a size if your line runs 1/2 in or 1/4 in. Choose the drain to match access: differential-pressure (this unit) suits enclosed cabinets, automatic (code A) for unattended drains, manual (code M) where an operator can bleed the bowl. Pick 5 um (W) when downstream valves or instruments need finer air than the 40 um standard. Gauge scale is selectable (MPa, psi or bar - this unit is bar) and an external round gauge is optional. Thread is PT as standard with G and NPT as order options; brackets are included on this family. Because flow is published as curves and 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. Without the K option, air cannot flow back through the unit. A filter regulator adds no oil to the line.
AirTAC publishes flow for this family as curves, not as a single rated number, so we do not quote a figure here. Tell us your application and line pressure and we will confirm the flow and sizing from the datasheet on request before you order.
W is the 5 um filter element, finer than the 40 um standard grade, so it strips smaller particles before the regulated outlet. The L in the code marks the low-pressure regulator type, and the T gives 3/8 in NPT ports; PT is the standard thread with G and NPT as order options. The unit keeps the differential-pressure drain, square bar-scale gauge and included 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.