Peggy, There are 2 sanitation hoses associated with my toilet. one on the port side from the bottom of the pump and the other is on the starboard side. The starboard side hose comes up through the deck, through a seacock and exits through the rear bulkhead in the head beside the port sanitation hose (pretty confusing description, see attached photo of the starboard side of the toilet). What is the function of this starboard sanitation hose and where might it go? Thanx