The AirTAC GFR400-10 AirTAC Filter Regulator NPT 3/8 in Low-Pressure is a genuine G-series filter regulator: water separation, 40 µm particulate filtration and balanced-type pressure regulation combined in a single body. It has PT3/8" ports, a manual drain and regulates 0.05 - 0.9 MPa (7 - 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 in the GFR series: it removes water and particulate from compressed air and regulates downstream pressure in a single body. This 400-size unit is fitted with a 3/8 in NPT port, a manual drain bowl in polycarbonate, a 40 um standard filter element, and a round pressure gauge reading in psi. It is the low-pressure (L) type of regulator, intended for circuits where the working pressure is set below the standard range's upper limit. Maximum working (inlet) pressure is 1.0 MPa (145 psi), and the operating temperature range is -5 to 70 C (non-freezing).
This is a genuine AirTAC part. The GFR family is published in 200, 300, 400 and 600 sizes with port sizes from 1/8 in to 1 in, a choice of manual, automatic or differential-pressure drains, a 5 um (W) element option, gauge scale choices, and PT, G or NPT threads. Flow for this series is published as curves rather than a single rated figure, so ask us to confirm the datasheet and sizing for your application on request.
| Model | GFR400-10 AirTAC Filter Regulator NPT 3/8 in Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 µm |
| Regulating range | 0.05 - 0.9 MPa (7 - 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 | Manual drain |
| Bowl material | PC |
| Pressure gauge | Fitted — round, psi 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". |
| M | Drain: Manual drain — this also sets the regulating band (0.05 - 0.9 MPa (7 - 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. |
| (blank) | Filtering grade 40 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Mounted ahead of a fixture clamping circuit on a CNC cell, this unit filters machining-air moisture and particulate and holds the clamping pressure the operator sets, with the psi gauge giving a direct local readout at the machine.
Installed as the single prep point feeding a packaging machine's valve island and actuators, it removes water and debris in one body and lets the set-up technician dial in the machine's working pressure on the round gauge.
Fitted at the drop feeding conveyor-mounted air-nozzle cleaning jets and diverting cylinders, it keeps grit and condensate out of the nozzles and holds the lower set pressure the low-pressure type regulator is intended for.
Choose the 400 size with its 3/8 in NPT port when your line runs at that connection and your flow demand sits in the middle of the GFR range; step up to 600 or down to 300/200 as the port and flow require. This unit carries the M code for a manual drain: you or the operator open the drain valve periodically to expel collected condensate, which suits attended installations; specify A (automatic) or leave it blank (differential-pressure) if you want the bowl to discharge itself. The 40 um element is the standard grade for general air prep; order the W variant if the 5 um grade is needed. The C2 code here gives a round gauge with a psi scale (MPa and bar scales are also available), and the mounting bracket is included. PT is the standard thread; G and NPT are catalogue options to order as specification. Because flow is published as curves and not as 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 the GFR series as curves, not as a single rated figure, so we do not quote one number here. Tell us your line pressure and the flow your application needs, and we will confirm the sizing against the datasheet on request before you order.
This unit's M code means the polycarbonate bowl has a manual drain: condensate collects in the bowl and is discharged when the drain valve is opened by hand, so it suits installations that are checked regularly. If you want the bowl to discharge itself, the GFR series is also available with an automatic drain (A) or the default differential-pressure drain - ask us for those variants.
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.