Have you used it before?? As Javi said it is very common that dump valves are labeled wrong. Regardless of labels the black tank should be vented through the roof and you should have had a black smelly volcano out that vent before lifting the toilet. Unless you mean waste came up in the toilet???
Welcome to the forum, Hank
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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