Vexilar Universal Adapter - Humminbird 7-Pin ADP031

AlumaDucer Adapter for Select Models The AlumaDucer is the world's only depth finder / fish finder transducer designed to transmit through Aluminum with ZERO signal loss. The revolutionary new AlumaDucer is built using a universal transducer connector. Along with the proper adaptor, you can fit it to almost any 200 kHz, 80/200 kHz or 50/200 kHz sonar. For the first time in boating history, the aluminum boat owner does not need to drill holes in the back of the boat to mount a transducer!