Enables the zippers on high buildings to be easily unzipped without having to climb a ladder each time you want to unzip the door panels. 
Each zipper requires one zip kit. 
Example:  Double Zipper Door : requires two zip up kits - one per zipper
 
Most of our 8', 10', 12', and 14' wide shelters require 2 of these kits per end.  Any shelter 18' or wider requires 3 of these kits per end.