Originally Posted by DustyD
I have a Thor 2014 ACE 29.2 with a constant black tank oder. I am looking for the black tank roof vent. I have found one vent on the roof but not two. Are both black and grey vented through one vent on this model?
The kitchen sink & the bath lavatory may be vented under their respective cabinets with an air emitance valve rather than through the roof. It's possible that's where your odor is coming from, easily replaced. Quite often the kitchen waste smells as bad, or worse, than the black.