The majority of the plumbing connections to are in the wet bay, behind the dress panel. It is relatively difficult to remove since components are attached to it on both sides and lines are going thru it. With some agility it is possible to work on things by reaching from under the panel. For power washer connection I removed the outside shower and replaced it with two boiler faucets. The Mountain Aire and London Aire may come with a cold water hose in on the panel.
If you order a coach from Newmar you may be able to specify some of your connection requirements as specials.
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