CSEC Cold shrink rubber end caps are usually used for environmentally seal and mechanically protect exposed cable ends using no tools, mastics or tapes. Cold shrink EPDM end caps are close-ended, tubular rubber tube that are factory expanded and loaded onto a removable core. When positioned over the end of a cable, or other cylindrical object, the core is removed to provide a reliable seal that protects your cable ends from environmental damage, like moisture, contamination and corrosion etc.