Marinco Pigtail Adapter, 50 Amp Locking to 50 Amp Locking Pigtail adapters are equipped with covers and sealing collars (where indicated), and are for use in wet locations. ; Marinco's unique sealing collar system with cover joins the adapter to the cordset with a positive, mechanical connection.; Product Features: Boat Side Female connector attaches to boat inlet or cordset, 50A 125V, Locking w/Sealing Collar System.; Dock Side Male plug attaches to dockside receptacle or cordset, 50A 125/250V, Locking.;