Transducer for Alum Hull

[tincan2]

I have a 24' Marshal Pilot house Alum boat. Just finished my restoration with a new v8 EFI, wiring, kicker, outside and inside sand, etch, and sharkhide coated. My next project is the electronics. My question is what type of Transducer for the Aluminum Hull. I want a powerfull at least 1K transducer but I am having a hard time finding a plastic one. Do they exist or do most people use a SS thruhull with some sort of bushing. Just worried about corrosion.

Any advice appreciated

[JETTYWOLF]

wrong forum......try Electronics forum. I can move for you. I HAVE THE POWER,