Airmar's B164 8-pin bronze, thru-hull mount transducer with 20 deg tilt provides depth and temperature. This transducer has an operating frequency of 50 or 200 kHz and mounts on a 16-24 deg deadrise angle.
Garmin Usa, Inc 010-11010-20 Garmin 010-11010-20 50/200KHZ B164 20DEG Depth/Temp 8-Pin