Humminbird XP 9 20 T Transducer. Your boat's hull must be of single-layer fiberglass construction and be free of trapped air or voids in order for a puck transducer to operate correctly so cored fiberglass metal and wood will not work. This unit is meant to be glued to your inner hull with a slow-cure epoxy which is included and connects to your compatible Humminbird sonar or fish finder system via the included 15-foot cable. Specifications for Humminbird XP 9 20 T Transducer 710147-1: Manufacturer: Humminbird Color: Black Features of Humminbird XP 9 20 T Transducer 710147-1: designed to mount to the inside of most fiberglass hulls with a deadrise less than 15 degrees fiberglass construction and be free of trapped air or voids meant to be glued to your inner hull with a slow-cure epoxy which is included Package Contents: Humminbird XP 9 20 T Transducer 710147-1 The Humminbird XP 9 20 T Transducer 710147-1 is a quality addition to the Humminbird lineup. For more great deals on Fishfinder Accessories by Humminbird please browse our Humminbird Fishing Gear page. Humminbird XP 9 20 T Transducer 710147-1