This Two Port Waterproof Connector Requires No Cable Stripping or Crimping. Insulation Piercing - Insulation Displacement Splicing Technology. Fully submersible, completely waterproof two port Insulation Piercing Connector AL9CU Dual Rated for Copper and Aluminum wire. Rubber Over-molded body ensures the Installer does not come into contact with bare metal conductor or the conductive material of the connector.