Adhesive Lined Shrink Tubing

Double-walled, or adhesive-lined, heat shrink tubing is how you make easy waterproof connections. As you heat the tube and it shrinks, it compresses a heat-sensitive adhesive inside the tube to melt into one waterproof seal. This sample set is a good place to start.

-- Alexander Rose  

Ancor Marine Grade Electrical Adhesive Lined Heat Shrink Tubing Kit
$12 for a pack of 8

Available from Amazon

Manufactured by Ancor