SIDE IMAGING & 2D SONAR SPLITTER 720101-1:

Y Cable - Side Imaging and Dual Beam - allows you to use two transducers on one unit without the use of a transducer switch. 

9 M SILR Y SIDE IMAGING LEFT-RIGHT SPLITTER 720102-1:

Y Cable - Separates Side Imaging into Left and Right Side Beams - for Side Imaging products only.  Allows the use of two side imaging transducers with one unit without the need for a transducer switch.