Amazon.com: Wirefy 180 PCS Heat Shrink Tubing Kit - 3:1 ...
Therefore, 3:1 shrink ratio tubing can be used in significantly more applications compared to 2:1 shrink ratio tubing. Additionally, 3:1 marine heat-shrink tubing shrinks around wires and terminals more tightly, eliminating any air gaps. Heat Activated Adhesive Lining. This is a waterproof shrink tubing with the internal adhesive layer.
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