Have RV Questions? Ask an RV Mechanic Online.
That's what I assumed, but there is a dump valve handle that is right up against the wall of the compartment, so I can't unscrew it.
I store the RV away from my home. I'll go there later today and take a photo of the panel and include it.
Here are the photos of the panel. I took a close up of the valve handle that can't be unscrewed because it is right against the edge of the panel.