Questions along the same lines... First time out with our 2020 HC 335BH 10th Anniv. We have a bath and a half. 2 pulls in the Convenience Center marked Black and Gray. Another in a hatch cover a couple feet back from C Center. Another pull is back behind the rear tire. Naming them from the front are they Front Head, Front shower/sink, kitchen sink, then back head/sink. If that's right then what all does the black tank flush service? Really like the rig. I'd like it even better if I knew what I was dumping and flushing. Everyone probably knows what I found in the one-size-fits-all owners manual about the tanks.
