[macojoe]

I haven't seen one??

But it sounds like the thru hull goes to a shut off or deverter, that will fill the live well or go to the wash down.
The hole in the live well drains to the bildge and your bildge pump gets rid of it.

As for the thing you can't reach behind the rod holders, there must be a conntor or something for a wash down hose.

Might have to remove the rod holders to get to it??

Now were are the pictures???