Jagwire's Aluminum Housing Connectors allow joining two sections of the same-size cable housings together in case you only have shorter sections and you need to make a longer one. It comes in 4 and 4.5mm diameters. Match the diameter of the housing sections on your bike. - Comes in a pack of 10

Extend housing runs using these double-ended junction end caps.

Jagwire's Open End Caps for Shift Housing are quality ferrules that put the finishing touch on your shift cable housing sections. They reinforce them so they stay straight and allow the cables and derailleurs to operate as smoothly as possible.