What is this through hull fitting on Grady Tournament 275?

[hydraporter]

I'm curious what this fitting is for? It's through hull and is located next to the raw water wash down on the starboard side of the boat. It's a brass fitting with what feels like a rubber insert in the middle.

Thanks for any help anyone can provide.

 

[Parthery]

Looks like the thru hull transducer for your fishfinder to me.

 

[leeccoll]

Plus one.

 

[hydraporter]

After googling an image for that you are both probably right. We bought the boat last year and it had a transom mounted side scan transducer on the boat already. Possible this was for the PO's original sonar.

Thanks for the input!