Black tank sensors behind the little panel and a nice place for a "Tornado" flush valve install. Verify what's below and drill through floor for the incoming hose. Pipe it over to the side close to Black dump valve. It is where you flush hose attaches. I have a HW27. THE BLACK TANK empties out bottom of tank so pushing a water flush back through the dump valve wont work.
Tornado has all the stuff included to do the install. The hose attachment fitting is anti-siphon anti backflow so health concerns taken care of. No black water can get back into water systems or leak out the flush fitting.
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