Belt Pusher

This is a key belt component as it's allowing you to sort or filter the items.

You have option to choose between Pusher and Sorter mode. 

Pusher is very useful when you have chain of factories of same type and you are pushing more resources than one can consume.

The pusher will try to push the item in direction of the arrow and if he can't he will let the resource pass.

Sorter on the other hand is strict. It's used to sort the items that are coming as you can setup a filter of the item that should be sorted and sorter will then push that type of item into direction of the arrow. If the item can't be pushed into that dirrection sorter will block the item to pass.