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This thru-hull transducer provides ultra-clear sonar pictures of objects, structure and fish that pass below your boat. This traditional CHIRP sonar and CHIRP DownVü/SideVü transducer is optimized for depth performance and rough conditions. It includes a built-in fast-response temperature sensor. For hull deadrises less than 5 degrees. GT51M-TH includes: 12-pin transducer with stainless steel stem, fairing block, isolation plate and bushings, mounting hardware and installation instructions.