3M(TM) Cold Shrink Insulator 8428-8, 500-800 kcmil, 10 per case This splice meets requirements of ANSI C119-1 and Western Underground Guide 2.14 for secondary splices rated up to 1 kV. 3M(TM) Cold Shrink Tubes are designed using a unique Cold Shrink delivery system. Products are supplied prestretched on a removable core for efficiency and ease of installation. Removal of the core (unwind) after positioning allows the product to shrink into position forming a moisture-tight seal. The live memory action of the specially formulated material ensures a permanent, durable environmental seal and insulation.