A plug boot or connector boot protects your cord connectors from fraying and damage while insulating them against the elements. Use these plug boots to seal the connections on your electrical plug and extend the cord's life span. The useful accessories fit midget twist-lock plugs, which are used for a variety of industrial devices and components. The plug boot fits around the bottom of the connector body, allowing a sure fit into the receptacle and plenty of room for a plug adapter. Find weatherproof plug boot and connector boot selections at Grainger.