Over the last few months, I have been replacing this and that on the boat to ready it for some summer fun - however, I am having a real tough time identifying what the following part is. Originally thought it was a transom shield anode, but my boat parts store cannot find the part number - a search of marinepartseurope.com usually yields results, but not this time.
We are beginning to wonder... can YOU help identify the rusty part in the picture below?

We are beginning to wonder... can YOU help identify the rusty part in the picture below?
