Dale,
I have a Dutchman Denali with 3 dump valves all plumbed from their individual tanks but into one main dump line (just like Chalkie's trailer).
When I go to dump, I always dump the black water first and then dump one of the grey tanks, then close the black tank valve, and last dain the second grey tank to 'clean out the line'.
Mike
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2013 Denali 330RLS, Fifth Airborne King Pin Box, Equa Flex, JT Strongarms
2011 Ford 250 6.7L dsl
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