3M Cold Shrink EPDM Tubes (8420 series) are open-ended rubber sleeves that are factory expanded and placed over a removable core. They are used to provide insulation and waterproof sealing for cable connections and terminations rated up to 1000 volts. The tubes are made of EPDM rubber and shrink to form a tight seal when the core is removed after positioning over the connection. They can be used for indoor, outdoor, overhead, buried, or submerged applications without additional heat or adhesives.