Hey all I am at a campground now. Be here till tomorrow. Total of three days with three of us. Grey tank almost full according to the sensors. Black tank still reading empty. Was thinking of running to go dump the grey tank for sure but do both. I also have the black tank wash out to hook a hose to. But nothing on my camper or in any of my manuals does it say what valve is for the black tank and what one is for the grey. I want to do the black first so I can rinse the line with the grey water. Is there a usual standard? Left is black tank and right is grey tank?? It's a 2016 heartland prowler 26 BHS. Thanks for any clarification
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