thanks lawndoctor,
that is a great help.
although, not knowing anything about the porta potty system and how it works, i am handy and do most things myself so i am trying to learn everything. If you know where i could get more info on this please let me know?
(how it pumps out, what hoses go out or go in, venting, holding tank, vacuflush, are all things i'm hearing but know nothing about)
i would also consider hiring a Dometic/vacuflush authorized installer like you did if i could find one in my area. Does the dometic fit in without any modifications, as if it was an original install?
you said it was "A big expensive job", could you tell me about how expensive?
thanks again, dave