The D-406-0003 is a DURASEAL® 12 to 10AWG blue Butt Crimp Splice with tin-plated copper alloy base metal, heat-shrinkable radiation cross-linked polyamide (nylon) with a polyamide-based hot-melt adhesive liner. This D-406 series splice can be used to obtain an environment-resistant one-to-one in-line (butt) splice in wires meeting the size range and diameter restraints specified. Wires are to be stripped per table, inserted into opposite ends of the crimp barrel. The sleeve must be heated along its entire length until the crimp marks are gone and the ends of the sleeve recover onto the wires.