I put a glob of petroleum jelly on the transducer, "rolled" it in place to prevent air bubbles, and then glued around the perimeter with silicone.
Previous boat had one glued inside, and one transducer thru hull
. After a lightning
strike that knocked out most electrics including the thruhull depth sounder
, I thought the locker this transducer was mounted in wasn't as dark inside as I remembered. Haulout that winter, I found why. The entire guts had been blown out, leaving just the thin plastic top to hold the sea back. Electronics
through the hull
can be an Achilles heel.