Ancor Marine Grade Electrical Heat Activated Adhesive Lined Shrink Tubing Package of 1 Black 48"(122cm) long sections with a 1"(25.4mm) diameter that shrinks to 5/16"(7.9mm). will not burn like PVC. Heat activated adhesive lining provides impervious seal to salt water, Shrinks at 257 DegreesF / 125 DegreesC Operating temperature range of -40 DegreesC to 110 DegreesC U