Under the steps with return in the wall in the aft cabin you will have to remove the step treads they are screwed in and the screws are hidden in the carpet you have to hunt
Since you are adding it in yourself, you may want to run a small hose to the head area as well. It was the one thing that always bothered me in the 310. Nothing worse than having a seat in a hot head to do your thing! Showering is also no fun when it's warm (yes, you can leave door open when you think about it).
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Boat Name: King Kong
"Boat + Water = Fun"
Dream 'Inn III -- 2008 400 Express
2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX