3M™ Cold Shrink Connector Insulators 8420 and 8430 Series Are Designed Using 3M’S Proprietary Cold Shrink Delivery System. Products Are Supplied Prestretched On A Removable Core For Efficiency and Ease Of Installation. Removal Of The Core (Unwinding) After Positioning The Splice Allows The Product to Shrink Into Position Forming A Moisture-Tight Seal. The Live Memory Action Of The Specially Formulated Epdm Material Promotes A Permanent, Durable Environmental Seal and Insulation, With A Typical Operating Te