John de winterized last night. Couple of questions that's not reall clear in the manuals. Can I add water into the head holding tank by using the the flush port and adding water, or does that just flush the drain in the wet bay? I also want to check the drain on the wtr. heater make sure it is in. Where can I find it. It was getting dark so I haven't started looking yet. Trying to pull out this evening when I get home. Going to Pere Marquette.