Airmar's B258 8-pin bronze, thru-hull mount transducer with fairing provides depth and temperature data. This transducer has an operating frequency of 50 or 200 kHz and mounts on a 0-25 deg deadrise angle.
Garmin Usa, Inc 010-10703-20 Garmin 010-10703-20 50/200KHZ B258 Depth/Temp 8-Pin