New owner waste tank question

[Mchartier3718]

I have a 2018 325BHQS and it has 3 pull valves in the side compartment doormarked black and grey. But then i noticed that on the back left side of the camper there is another pull valve and a sewer hose connection. What is this for? I thought all the tanks drained at the hose connection by the front of kitchen slide?

[bansai]

You have multiple grey water waste tanks on that I think. The 'extra' one in the back is probably for your outdoor kitchen if I remember right.