Raymarine DST800 Thru Hull Active Depth, Speed and Temperature Transducer
Operates at 235kHz so there is no interference with your 50/200 kHz fishfinder transducer.
Airmar's Smart™ Sensors have embedded microelectronics, meaning the signal is processed from within the transducer itself, eliminating the need for an ST70 transducer pod.
Compatible hull material: aluminum and fiberglass
Hole diameter for installation: 2"