Humminbird 720101-1 9 M SIDB Y 9-Pin Side Imaging Dual Beam Splitter Cable. Overview: Y Cable - Side Imaging and Dual Beam - allows you to use two transducers on one unit without the use of a transducer switch. Features - Y Cable - Side Imaging and Dual Beam - allows you to use two transducers on one unit without the use of a transducer switch. - For use with Side Imaging products only, in conjunction with a dual beam transducer only. For improved high speed performance for bottom tracking. - 30" length. - Supports MEGA Side Imaging.