Marinco 121A Pigtail Adapter, 30A Locking to 50A (125/250V) Locking Part No. 121A Product Features Female Connector: 30A 125V, Locking with Sealing Collar System, attaches to cordset or boat inlet Male Plug: 50A 125/250V Locking, attaches to dockside receptacle or cordset Note: 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 which provides maximum moisture protection.