I don’t know much about rvs, but my friend knows more. He was surprised we couldn’t find a valve to close the black water tank so it could be dumped without a poop shower between uncapping and connecting a draining hose. I haven’t been able to find any mention of a surprise location for it, and youtube videos of other identical ones for sale seem to not have one by the cap, like mine. Is there one hidden well on these models? Or are they sold without them? If they are sold without them, is there any good news or do I need a hazmat suit?