One-size-fits-all diagrams rarely fit one size,
much less, all....which is the reason I don't like 'em. And, as long as the boat is equipped with a holding tank or a CG Certified Type I MSD treatment device (in waters where the discharge of treated waste is legal--which include the Chesapeake Bay), except for "use only hoses rated for sanitation and double clamp all hose connections," there is no "code" for sanitation systems. The best installations are the simplest, most straight-forward. You'll find some guidelines at the link below...and I'll be glad to help you work out the details.