Humminbird 9-M-SILR-Y Cable Model: 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. Used in applications where the a plastic thru the hull transducer is required on a boat with a deep V hull or the motor or other items on the transom of the boat may block one side of the transducer and distort readings. 30″