The AirTAC GFR400-10 AirTAC Low-Pressure Filter Regulator PT3/8 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 low-pressure filter regulator: one body that removes water and particulate from compressed air and regulates downstream pressure, so a single size-400 unit conditions and controls the air supply at a 3/8 in PT port. This configuration carries the 40 um standard filter element, a manual drain bowl in PC (polycarbonate), an embedded square gauge scaled in psi, and the low-pressure regulator type for circuits that run below standard line pressures. 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 series is available in sizes 200, 300, 400 and 600 with port sizes from 1/8 to 1 in, and with choices of drain type, filter grade (40 um standard, 5 um optional), gauge scale and thread (PT standard; G and NPT are order options). Flow is published as curves rather than a single rating, so we confirm the datasheet figures for your application on request.
| Model | GFR400-10 AirTAC Low-Pressure Filter Regulator PT3/8 |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (PT 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 — square, 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). |
| F | Gauge shape: Square. 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. |
| (blank) | PT 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) |
Fixture clamps and hold-down cylinders that are specified to run at reduced pressure get both conditioning and regulation from one GFR400-10 in the supply line, with the psi-scaled square gauge giving the operator a direct reading at the station.
On packaging lines where cylinders, gates and diverters run at modest regulated pressures, the GFR400-10 filters water and debris out of the shop air and holds the supply steady, while the manual drain is emptied during normal changeover checks.
Bench rigs and test stations that feed sensitive pneumatic instruments use the 40 um element to keep particulate and condensed water out, and the low-pressure regulator type to set the gentle supply pressure those devices expect.
Start with the size/port step: size 400 with a 3/8 in PT port suits lines whose air demand sits in the middle of the GFR range, and stepping up to size 600 gives a larger port and more flow capacity. Because this is the low-pressure (L) type, it is the right choice where the regulated pressure is below what a standard unit is set up for; the exact regulation range for the low-pressure type is not published, so confirm it with us against your setpoint before ordering. The manual drain means an operator opens the bowl drain during checks rather than relying on automatic or differential-pressure action - simple and reliable where visits to the unit are already routine.
Other decodable choices: the 40 um element is standard here (5 um is available as code W if finer filtration is needed); the square gauge is fitted and scaled in psi (MPa or bar scales and an external round gauge are alternatives); the mounting bracket is included; and PT is the standard thread, with G (BSPP) and NPT available as order options. Flow is published as curves, not a single rating, so ask us to confirm sizing against your application before you order.
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 number, so we will not quote a figure that is not in the datasheet. Send us your application details and we will confirm the flow and sizing data for the GFR400-10 from the datasheet on request before you order.
The L in the code marks the low-pressure regulator type, intended for circuits regulated below standard line pressures; the exact range for the low-pressure type is not published, so confirm it with us against your setpoint. The M marks a manual drain: the PC bowl is emptied by hand during maintenance visits, instead of the automatic or differential-pressure drain options available in the series.
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.