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The Garmin GT17M-THF 20° Thru-Hull Transducer is a stainless steel unit ideal for midsize fishing and cruising boats. It features high-definition 1 kW midband CHIRP (80-165 kHz) sonar that clearly defines fish targets down to depths of 1,800' in saltwater and 2,400' in freshwater. This thru-hull transducer offers beamwidths of 16° to 24° and comes in a durable flush-mount stainless steel housing.