Garmin Bronze Thru-hull Mount Transducer B260
Garmin's bronze thru-hull mount transducer works well in deep water.
A popular narrow beam, this 8-pin 1 kW transducer has a depth of 1,800 to 2,500 ft; an operating frequency of 50 to 200 kHz; a beamwidth of 19 to 6 degrees; and a 0 to 20 degree deadrise.
Transducer kit comes with installation instructions. Follow the instructions carefully to avoid damaging your boat.