Unary Vents don't always connect to pipe networks
Created by: Wiggle-Bot
http://i.imgur.com/PxP0Lno.png
When connecting a unary nent to a network, if the tile the unary vent is on is already occupied by some other piping, the unary vent will not visually connect to the pipes and will be considered a part of a network consisting of just itself. This does not always happen, as seen with the bottom most bent pipe.