The AirTAC GFR400-10 AirTAC Filter Regulator, NPT3/8, Low-Pressure 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 filter regulator: it removes water and particulate from compressed air and holds downstream pressure at a set point, in a single body. This size 400 unit is ordered with a 3/8 in NPT port, a manual drain on the polycarbonate bowl, the standard 40 um filter element, and the low-pressure regulator type. A square pressure gauge reading in MPa is fitted, a reverse/check valve is installed, and a mounting bracket is included.
This is a genuine AirTAC part from the GFR series, which spans sizes 200 to 600 with ports from 1/8 to 1 inch, a choice of manual, automatic or differential-pressure drains, 40 um or 5 um filtration, and PT, G or NPT threads. Maximum inlet pressure is 1.0 MPa (145 psi) and the working temperature range is -5 to 70 C, non-freezing. Flow is published as curves rather than a single rating, so ask us to confirm datasheet figures for your application.
| Model | GFR400-10 AirTAC Filter Regulator, NPT3/8, Low-Pressure |
|---|---|
| Series | GFR400 filter regulator |
| Port size | PT3/8" (NPT 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, MPa 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. |
| 1 | Gauge scale: MPa. 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) |
Positioned ahead of clamping cylinders and their control valves, the unit strips water and machining particulate from the shop air supply and holds the clamp circuit at a low, stable set point so parts are held consistently through the cycle.
On a carton-forming or wrapping line, the filter regulator conditions the air feeding directional valves and small actuators, keeping condensate and debris out of the valve stack while maintaining the gentle pressure the machine's low-pressure circuit calls for.
Feeding an end-of-arm gripper on a pick-and-place robot, the unit filters the compressed air protecting the gripper's seals and internal passages, and the low-pressure regulator type suits circuits where delicate parts must not be gripped at full line pressure.
Size 400 with a 3/8 in NPT port sits in the upper-middle of the GFR range; step between sizes 200, 300, 400 and 600 as your line's flow demand changes. Because flow is published as curves rather than a single rated figure, ask us to confirm sizing against your application before ordering. This unit is the low-pressure regulator type; its exact adjustment range is not published, so confirm the set-point window with us. The manual drain means an operator opens the drain periodically to clear condensate; automatic (A) and differential-pressure (blank) drains are available if you prefer hands-off removal. Filtration is the standard 40 um element, with a 5 um (W) element optional. The fitted square gauge reads in MPa; psi or bar scales and an external round gauge are order options. PT is the standard thread, with G and NPT as orderable options - this unit is specified in NPT. A mounting bracket is included.
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 series as curves rather than a single rated figure, so we do not quote one number. Send us your application details - line pressure, downstream demand and port size - and we will confirm the datasheet flow curve and check the sizing with you before you order.
M is the manual drain. Condensate collected in the polycarbonate bowl must be drained by opening the drain valve periodically. If you prefer hands-off condensate removal, the same unit can be ordered with an automatic drain (code A) or the default differential-pressure drain (no code).
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.