Garmin Transom Trolling Transducer f/echo Series Fishfinders - 4 Pin [010-10249-20]Dual Beam Transducer with Transom Trolling Motor Mount for echo Series Fishfinders Want to use your echo series fishfinder in more than one vessel? A second transducer can make the process a lot easier. It comes with all of the hardware you need to mount on your transom or trolling motor. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more