3M™ Cold Shrink End Caps environmentally seal and mechanically protect exposed cable ends using no tools, mastics or tapes. They are close-ended, tubular rubber sleeves 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. (I.e. moisture, contamination, corrosion, ozone, ultra-violet and radiation). They are easily installed and cleanly removable, there are a number of end caps available to accommodate a wide range of sizes.