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I have 2 black tank valves, when emptying I open the left side, then the right, after flushing I close in reverse.
I leave my sewer line hooked up with all valves closed at campsites and only open the valves to dump when necessary.
Some, but not me leave the gray valve open, but that seems to be personal preference, just do not leave Black open as only the liquid will drain and the bad stuff will pile up and dry into a mess.
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