Yes, I see it has a vacuum hose run to it. But, does it need that to work? If not then this might be a viable alternative to the power brake check valves many of us currently use. But I think the duals are input because the single runs to the airbox.
IIRC these systems feed filtered air to the exhaust on decel to finish combustion, prevent backfiring.
Aspirated air injection
Air injection can also be achieved by taking advantage of the negative pressure pulses in the exhaust system at engine idle. A sensitive
reed valve assembly called the aspirator valve is placed in the air injection pumping, which draws its air directly from the clean side of the
air filter. During engine idle, brief but periodic negative pressure pulses in the exhaust system draw air through the aspirator valve and into the exhaust stream at the catalytic converter. This system, marketed as Pulse Air, was used by
American Motors,
Chrysler, and other manufacturers beginning in the 1970s. The aspirator provided advantages in cost, weight, packaging, and simplicity compared to the pump. Also, since there is no pump requiring engine power, parasitic losses associated with the pump are eliminated. However, the aspirator functions only at idle and so admits significantly less air within a significantly narrower range of engine speeds compared to a pump. This system is still used on modern motorcycle engines, e.g. the Yamaha AIS (Air Injection System).