I noticed a similar setup on this thread ( http://www.pearsonariel.org/discussi...riel-97/page10 ) on post 139. On my boat the unidentified galaxy blob would be on the right where the smaller seacock is, the seacock on the left looks similar to my first image.

On this page ( http://www.pearsonariel.org/discussi...launching+boat ) post number 16 is what I believe you were talking about, thruhull drains for the cockpit?