Originally Posted by Redloon (Post 231419)

On my 77 V-20 center console there is a triangular shaped in deck 'livewell' up front that has the same type of drain hole as shown in the upper left corner of your picture. Mine uses the same type of rubber plug to stop the water from draining out.

Where I'm going with this is that I have no plumbing going from the hole in my 'livewell' and you can feel the plywood underneath the fiberglass if you stick your finger in there. I've got soft plywood on the bottom of my 'livewell' because the exposed plywood in that hole was never sealed with resin or anything else. Your drain hole looks exactly like mine - you might want to check that out and seal the exposed plywood if it needs it.