Re: How do you remove a thru hull transducer???
A plastic thruhull transducer could be described as you did. Look inside. A thru hull transducer will have a 1/4" wire coming out of it, and may have a screw on cap that will allow you to remove it. If you think its leaking, dry the area with a hair dryer, and sprinkle some powdered soap around it. Launch the boat and watch. Even a slow seep will show in the soap powder. If its a patch job instead of a transducer, and it doesn't leak, think twice about a serious glass job. If its a leaking patch, and you want a transducer, investigate why there isn't one there now. It could have been in a cavitation area.