3M Cold Shrink Connector Insulators 8420 Series are open-ended, tubular, rubber sleeves which are factory expanded and assembled onto a removable core. The core is removed after the tube has been positioned for installation over an inline connection, terminal lug, etc., allowing the tube to shrink and form a water-resistant seal. The insulating tube is made of EPDM rubber which does not contain chlorides or sulfur. Six diameter sizes will cover a range of cable up to 1000 volts for copper and aluminum conductors from 10 AWG through 1000 kcmil. To extend the useful life of this product in applications which are continuously exposed to high levels of ultra-violet radiation, overwrap with Scotch Super 33+ Vinyl Electrical Tape or Scotch Self-Fusing Silicone Rubber Electrical Tape 70. Applications: Primary electrical insulation for all solid dielectric (rubber and plastic) insulated wire and cable, splicing rated up to 1000 volts, Direct burial and submersible, For indoor and outdoor use, Physical protection and moisture sealing for air-insulated connectors and lugs such as spacer, cable and lug connections to bus bar, Insulation of secondary splices, copper or aluminum conductors, Relocation of service, Dig-in repairs, Sheath repairs, Environmental sealing for communication and other non-electrical applications