Black tank Flush
Sticker by the flush hose port says 'drain valves must be open when rinsing blak tank'. Why must they be open as there should be no pressure buildup, or am I missing something?
Forum Discussion
I close my valve when flushing the black tank. We rarely fill it so I let the rinser run ununtil it gets quiet. Then I know the tank is at least half full. So then I let it run for another minute or so and then open the valve. I might do this a couple of times if there isn't any one else waiting at the dump station.
