I have a Catilina 27 - (1985) I cant find the pump out "valve" - not on deck as show in scimatic that I have , could it be in the anchor locker on the bow? I followed a 2 plus inch from the holding tank to the anchor locker- has a hatch( threaded) . I just bought this boat and am trying to figure out the plumbing system. Please call if you can 707-206-8302 or E Mail -larry.conover@sbcglobal.net