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Stated problem was no labels. To eliminate any guessing (if the dealer cannot answer your question) take a hose, fill your black tank thru the toilet. Pull a valve and if the toilet does not dump, that valve is your gray. FYI, our 3915 has two grays, two blacks, the left hand pulls are 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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