Nemo
I have a 135 gal tank in my 23'. I put a 13 gal fresh water tank in that space. The pump in mounted inside the console and the shower head comes out the side thru a flush mount fiting. The water fill cap comes up thru the floor in the forward seat in front of the console
The fresh water rinse sure comes in handy after a swim or snorkel/dive trip
BTW: The dog has plenty to drink on those long fishing trips