Picture 1 is a brass water pressure regulator that you can attach to the white potable water hose. The interstate is supposedly fitted with a regulator inside the city water attachment, but I'm not sure I'd trust it.
Picture 2 - have no clue.
Picture 3 is a gas pipe to allow you to attach a portable propane grill to the right rear propane box.
2012 Interstate Coach
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Picture 2 is assorted parts for the Kenwood/Garmin head unit. The long silvery thing is a tool for removing the unit from the dashboard. The square thing with the adhesive backing is a spare metal base for the magnetic-mount GPS antenna.
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