The Furuno MB1100 Transducer Matching Box with 10pin Connector is used to connect specific transducers with no connector to Furuno 10 pin connector fishfinders. Furuno and Airmar transducers without a diplexer are wired directly to the MB1100 which then plugs into the Furuno DFF1, FCV-620, FCV-627, FCV-585 or FCV-587 10-pin connector. Please Call Toll Free 800-477-2611 for more information.