The AirTAC GFR400-10 AirTAC Filter Regulator NPT 3/8, 5 um Manual Drain 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 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 GFR400-10 is an AirTAC size-400 filter regulator: filtration and pressure regulation combined in one body, removing water and particulate from compressed air while holding a set downstream pressure. This configuration has 3/8 in NPT ports, a 5 um filter element (the fine grade; 40 um is the standard option), a manual drain on the PC bowl, the low-pressure regulator type, an embedded square gauge with psi scale, a reverse/check valve fitted, and the mounting bracket 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 is published in sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, PT as the standard thread and G and NPT as order options, a choice of differential-pressure, automatic or manual drain, 40 um or 5 um filtration, and gauge scales in MPa, psi or bar. Flow is published as curves rather than a single rated figure, so we confirm the datasheet and sizing figures on request.
| Model | GFR400-10 AirTAC Filter Regulator NPT 3/8, 5 um Manual Drain |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 5 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 — 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". |
| 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). |
| 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) |
On an assembly cell where clamps and hold-down cylinders run at a set pressure below the main line supply, this unit filters the supply air and holds the regulated pressure, with the psi gauge giving the operator a direct readout at the station.
Filling, sealing and cartoning machines use many small actuators fed from one drop line; a 5 um element protects the directional valves from particulate and the regulator holds a steady supply pressure while the manual drain clears accumulated water at shift checks.
Spray guns, coating heads and similar low-pressure air tools need a supply held well below standard line pressure; the low-pressure regulator type of this unit is intended for that job, with the check valve holding the setting against supply fluctuation.
Size and port are the first choice: 200, 300, 400 and 600 step up in port and flow capacity, so match the size to the air demand of the circuit - here size 400 with 3/8 in NPT ports. Drain type is a real decision: manual drain (this unit) needs periodic draining by hand, while automatic and differential-pressure drains discharge condensate without attention. Filter grade is 40 um standard or 5 um fine (this unit, code W) when downstream equipment needs cleaner air. The embedded square gauge is standard with MPa, psi or bar scales (this unit is psi); an external round gauge is optional. Thread is PT standard with G and NPT as orderable options, and the bracket is included.
One honest note before ordering: AirTAC publishes flow as curves, not a single rated figure, and the exact regulation range of the low-pressure type is not stated in the published data. Ask us to confirm sizing and the low-pressure range against your application 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 this family as curves rather than a single rated figure, so we do not quote a l/min, m3/h or SCFM number. Tell us your application and air demand and we will confirm the sizing against the datasheet curves on request before you order.
The M in the code selects a manual drain: condensate collects in the bowl and is released by opening the drain by hand, which suits stations checked as part of a routine. Automatic and differential-pressure drains are available in the same series if you prefer unattended draining. The W in the code selects the 5 um element instead of the 40 um standard, for cleaner air to sensitive downstream equipment.
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.