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Garmin GT15M-IH Plastic, In-Hull, Mid-Band CHIRP Transducer - 85-165kHz, 600W, 8-PinGT15M-IH Plastic, In-Hull, Mid-Band CHIRP Transducer - 85-165kHz, 600W, 8-PinGT15M-IH transducer is ideal for boats that want to install the transducer inside a fiberglass hull and not on the transom ... Learn More