Connect a port/starboard pair of thru hull or transom mount transducers to the sonar unit with this 12-pin Y-cable. This cable allows the use of two different transducers to produce the left and right SideVanduuml images to avoid engine lower unit or keel/hull shadowing. The right-side (starboard) transducer is used for Traditional, ClearVanduuml , and right- SideVanduuml images plus water temperature and transducer ID. The left-side (port) transducer is used for left-SideVanduuml images. Compatible with all 12-pin GT transducers