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Your black valve should remain closed except when you dump. Grey lines can remain open. Some folks prefer to leave gray valves closed which is fine as long as you remember to dump. We keep our greys open until a day or two before we dump the black and then dump after dumping both of the black tanks.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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