1) These valves are found on washing machines, and are intended to mix hot and cold water, so the inlets are actually the 3/4” threaded hose fittings. I had hoped to use them the other way, and have 2 outlets, but unfortunately when I connect pressure the other direction, it leaks through both of the threaded connectors... so ultimately, you simply need to cap one of the inlets off (I used the end of a sprinkler hose) and use it as a single control device.
These 2 port solenoids valves are what I started out using when trying pneumatics. I harvested them from defunct washing machines and ice makers. They’re intended to control the flow of water, but can be adapted for air control.