The REV Pneumatic Hub is a standalone module that is capable of switching both 12V and 24V pneumatic solenoid valves. The Pneumatic Hub features 16 solenoid channels which allow for up to 16 single-acting solenoids, 8 double-acting solenoids, or a combination of the two types. The user selectable output voltage is fully regulated, allowing even 12V solenoids to stay active when the robot battery drops as low as 4.75V.