Conveyor Splitter

A Conveyor Splitter is a building that takes items from a single input belt and outputs them between three other belts.

Speculation on types
There are thought to be three types of splitter, each with different sorting capabilities. It is unknown if they are separate buildings, upgrades, or settings. Not all of these are implemented in the game currently.

"Basic"
The standard splitter appears to simply split items between its outputs in sequence.

"Sorter"
Unknown, but seems to send a specified item out its side outputs, sending all others out its forward input.

"Multi Sorter"
Also unknown, but theorized to function as the "sorter", but allowing for lists of items to each output.