The AirTAC GFR400-10 AirTAC Filter Regulator, NPT3/8, Auto Drain 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 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 GFR400-10 is an AirTAC GFR-series filter regulator: it removes water and particulate from compressed air and holds downstream pressure at a set point, in a single body. This configuration is the size 400 unit with a 3/8 in NPT port, an automatic drain that empties the bowl without operator attention, the standard 40 um filter element, a low-pressure regulator type, a round pressure gauge reading in bar, and a built-in reverse (check) valve; it is supplied without a mounting bracket.
This is a genuine AirTAC part. The GFR family is made in sizes 200, 300, 400 and 600 with ports from 1/8 in to 1 in, plus drain, filter-grade, gauge and thread options, and a maximum inlet pressure of 1.0 MPa (145 psi); operating temperature is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm sizing and datasheet figures for your application.
| Model | GFR400-10 AirTAC Filter Regulator, NPT3/8, Auto Drain |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT thread) |
| Filtering grade | 40 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, bar 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. |
| 3 | Gauge scale: bar. 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. |
| 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" · 40 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Filtering the supply and holding a steady low set-point pressure on the clamping cylinders of a pneumatic press, with the automatic drain clearing condensate through the shift without operator attention.
Conditioning air for the pick-and-place cylinders and grippers on a packaging conveyor, where the built-in check valve holds the downstream circuit if the supply pressure dips.
Feeding filtered, regulated air to bench instruments and small test rigs on a laboratory manifold, with the bar-scale gauge giving a local set-point readout at the bench.
Size and port set the capacity: step up from 200 to 600 as air demand grows; this unit is size 400 with a 3/8 in NPT port (PT is the catalogue standard thread and G or NPT are order options - this unit is ordered in NPT). Drain type matters in service: automatic empties the bowl without operator attention, manual needs a periodic press, differential-pressure dumps when the pressure drop rises - this unit is automatic. Filter grade is 40 um standard; specify W for the 5 um element where finer filtration is needed. Gauge scale can be MPa, psi or bar (this unit: round gauge, bar). The L code marks the low-pressure regulator type, whose exact adjustment range is not published, so confirm it with us before ordering. Flow is published as curves, not a single rating - 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. The reflux valve permits reverse flow through the unit. A filter regulator adds no oil to the line.
Flow for the GFR400-10 is published as curves, not as a single rated figure, so we do not quote one number. Send us your application details and we will confirm the sizing from the AirTAC datasheet on request.
The L marks the low-pressure regulator type, and K adds a reverse (check) valve that stops downstream pressure backing up through the unit. The exact adjustment range of the low-pressure type is not published, so ask us to confirm it against your set point.
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.