FIXED!
There appears to be an inlet and an outlet. If you hook it up backwards you get the air display (looks kind of cool). So the if you have the unit face up and the G 1/8 connectors facing you, then the intake is on the left side and the output is on the right side. Perhaps the web store already says this, but it wasn't discernible to me.
Added:
I obviously need better light or new glasses as the in/out is marked on the back of the unit.