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To answer your question: No, there's not a secondary valve in the black tank or the gray tank dump plumbing.
That said, Theoldroaddog's suggestion of a twist on, terminal valve is a great idea, not only to eliminate the "surprises" that occasionally occur, but as additional "insurance" against that "deluge of stink" that happens if there's a catastrophic failure..... A "well spent $20" for sure !!!!!
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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