Peggie, I just aquired my 1986 Hunter 25.5, and it has been setting in the marina for about a year,(with out use) (it was a divorce sale). I want to replace the fresh water lines (and pump) to the sink and vanity, and am not sure what to use. Polyethylene, polypropelene, etc. I think dark tubing would be better to minimize bacteria growth. What is the standard today? What would recomend? Thanks.