Marinco Pigtail Shore Power Adapter 30A 125V Boat to 50A 125250V Dock The Marinco Pigtail Shore Power Adapter 30A Boat to 50A Dock allows you to connect from one dockside receptacle to one boatside inlet of a different power configuration. Fully molded and equipped with Marinco unique sealing collar and covers for use in wet locations. Pigtail adapters are equipped with covers and sealing collars where indicated, and are for use in wet locations. Marincos unique sealing collar system with cover