The AirTAC GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, 5 um 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 GFR400-10 is a filter regulator: one body that removes water and particulate from compressed air and then regulates the downstream pressure. This size 400 unit has 3/8 in NPT ports, an automatic drain that discharges collected condensate without manual attention, and a 5 um filter element for finer filtration than the 40 um standard grade. The regulator is the low-pressure type, intended for circuits that run at lower set pressures. An embedded square gauge reading in psi is fitted, the polycarbonate bowl shows the condensate level at a glance, a mounting bracket is included, and maximum inlet pressure is 1.0 MPa (145 psi) with an operating temperature of -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 ports from 1/8 to 1 in, and options include manual or differential-pressure drains, the 40 um standard element, gauge scales in MPa, psi or bar, an external round gauge, and G, NPT or PT threads. Flow is published as curves rather than a single rated figure, so ask us to confirm the datasheet figures for your application before ordering.
| Model | GFR400-10 AirTAC Filter Regulator, NPT 3/8 in, 5 um |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT 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 — 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". |
| 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. |
| (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. |
| (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" · 5 µm |
|---|---|
| One size down | GFR300 |
| One size up | GFR600 |
| Add lubrication | GFC400-10 (two-unit set) |
Feeding carton-sealing and case-packing cylinders on a packaging line, where the 5 um element keeps fine contamination out of directional valves and the low-pressure regulator holds a gentle set pressure for light product-handling motion.
Supplying pneumatic clamps and swing clamps on CNC fixture circuits that are set well below standard line pressure, with the automatic drain keeping condensate out of the clamp cylinders between cycles.
Providing clean, regulated pilot air to large automated process valves on a plant line, where the 5 um grade protects the pilot solenoid and the psi gauge gives operators a direct read of the pilot set point.
Size and port set the capacity envelope: the 400 frame with 3/8 in NPT ports sits mid-range in the GFR line, which steps from 1/8 in (size 200) up to 1 in (size 600). Drain type is a real choice: automatic (this unit) discharges condensate on its own, while manual and differential-pressure drains suit duty where you want direct control or air savings. The 5 um element (code W) is the finer option over the 40 um standard. The square gauge here reads psi; MPa and bar scales and an external round gauge are alternatives. Thread is NPT on this unit; PT is the standard and G (BSPP) is orderable. A bracket is included. Because flow is published as curves, not 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 rather than a single rated figure, so we do not quote a number here. Send us your application details and we will confirm the datasheet flow curves and sizing for the 400 frame with 3/8 in NPT ports before you order.
This GFR400-10 is the L (low-pressure) variant of the GFR400 series: the regulator is built for circuits that operate at lower pressures than the standard type. The exact adjustment range for the low-pressure type is not published in the catalogue we transcribe, so ask us to confirm it against your set point. Everything else decodes normally: automatic drain, 5 um filter element, square psi gauge, NPT 3/8 in ports, and a maximum inlet pressure of 1.0 MPa (145 psi).
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.