Garmin GT15M-THF 20 Degree 600W SS Thru-Hull TransducerGarmin GT15M THF 20 Degree 600W SS Thru Hull Transducer is engineered for streamlined performance on midsize fishing and cruising boats. This flush mounted, stainless steel transducer minimizes drag while delivering pristine sonar returns, helping you locate fish, structure, and bottom depth with confidence. Experience mid band CHIRP sonar that delivers high definition targets and clear structure down to 1,200 ft in saltwater and 1,900 ft in