The AirTAC GFR400-10G AirTAC Filter Regulator 3/8 in 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 automatic 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 GFR400-10G is a size 400 filter regulator: water and particulate filtration plus pressure regulation combined in one body. This configuration is built with a G3/8 (BSPP) port, an automatic drain that expels collected condensate without manual attention, and a fine 5 um filter element (code W) for cleaner downstream air than the standard 40 um grade. It is the low-pressure (L) type regulator, fitted with an external round gauge reading in psi, and a reverse/check valve (K) is included. Mounting bracket is not supplied (code J). 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 spans sizes 200, 300, 400 and 600, with port options from 1/8 in to 1 in, G (BSPP) or NPT threads to order against the PT standard, differential-pressure, automatic or manual drains, 40 um or 5 um filter grades, and square or round gauges with MPa, psi or bar scales. Because AirTAC publishes flow only as curves rather than a single rated figure, we confirm flow and datasheet figures for your application on request.
| Model | GFR400-10G AirTAC Filter Regulator 3/8 in Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (G (BSPP) 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 | Automatic 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". |
| A | Drain: Automatic 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. |
| G | G (BSPP) 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) |
Fixture clamps and swing cylinders on an assembly line that are specified to run at reduced pressure. The low-pressure type regulator sets the clamping force gently, the 5 um element keeps fine valve spools clean, and the automatic drain handles condensate on a continuously running fixture supply.
A packaging machine's cylinder and actuator circuit fed from a plant air main. The filter regulator removes water and particulate before the directional valves, the check valve holds the set circuit against backflow from adjacent drops, and the psi gauge gives operators a readable setpoint at the machine.
Supplying air to pneumatic transmitters, sample-handling actuators and purge lines in a process analyzer cabinet. The 5 um grade protects sensitive pilot and instrument components, the automatic drain suits an enclosed cabinet that is not opened daily, and regulation is set at the low pressures such instruments require.
Choose the size and port step against the air consumption of the machine or line being supplied - the 400 size with its 3/8 in port sits in the middle of the GFR range, one step above the 300. Drain type is a real choice: automatic drain (as fitted here) suits unattended or hard-to-reach installations, manual drain suits supervised points, and differential-pressure is the catalogue default. Filter grade matters downstream: 40 um is standard protection, while the 5 um element on this unit is the choice for finer pneumatic components. Gauge style and scale are selectable - this unit carries an external round gauge in psi; embedded square gauges and MPa or bar scales are alternatives. Thread is PT as standard with G (BSPP) and NPT available to order, and a bracket is optional (omitted on this unit). One honest note on sizing: AirTAC publishes flow as curves, not a single rating, so ask us to confirm the flow figures 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 curves rather than a single rated figure, so we do not quote a rated flow, Cv or SCFM number. Tell us your application and we will confirm the flow figures from the datasheet for this 3/8 in size on request before you order.
The automatic drain (code A) expels condensate collected in the PC bowl without anyone opening it, which suits unattended or hard-to-reach installations. Manual-drain versions are opened by hand, and differential-pressure drain is the catalogue default. Note that the regulation range of this low-pressure (L) type is not published as a single figure - we confirm it from the datasheet on request.
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.