Flush valve location for second holding tank

Hi, I'm a new owner of a Elkridge 35QSQB and I am having trouble locating the flush valve for the rear black water tank. I see the release valve but don't see a valve to flush it out like on the front. I found an unlabeled valve on the opposite side of the Elk near the outdoor speakers/cable hookup but didnt want to shoot water in it without asking what it was!
Thanks!

David
 
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