Marinco Y Adapter 2-30A To 30A #157AY. The Marinco Y Adapter 2-30A Locking to 30A Locking is equipped with covers and sealing collars for use in wet locations. Marinco Adapters are safe, reliable, compact and weather resistant. Comes with 5 year warranty. Female 2-30A 125V locking with sealing collar system connector attaches to shore power cord or boat inlet. 30A 125V locking male connector attaches to dockside receptacle or cordset.