What is this black plastic ring for in my bilge?

Enough Already

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I assume it is some sort of location mount for a thru-hull transducer but just wanted to know for sure. About 3.5" diameter. This is at the stern wall, starboard side on a 2001 265 Express. Located very top edge of the attached photo.

IMGP3484.jpg
 
mount for an in-hull transducer. looks just like the one i had on an airmar p79. ron