Need a waterproof seal on your electrical connections? 3M Heat Shrink Molded Shapes are up to the task. Available in breakout boots and end caps, each shape is easy to install and provides exceptional protection from chemicals, water, moisture, air and dirt. 3M heavy duty breakout boots provide environmental and mechanical protection for multi-conductor armored or sheathed cables. 3M heat shrink molded end caps help seal cable ends and can be fitted with air valves making them suitable for pressurized cable applications.