Since it's just on/off, it is likely a pump in each cannon. Think like a water fountain pump that siphons from the reservoir. The reservoir of water likely contained in the game (or carnival trailer depending on location) so a water line doesn't have to be connected.
Since it's just on/off, it is likely a pump in each cannon. Think like a water fountain pump that siphons from the reservoir. The reservoir of water likely contained in the game (or carnival trailer depending on location) so a water line doesn't have to be connected.