I have a 305RL....looks like the galley tank is higher. The shower tank sits down with the black water in the drop frame area. It definitely didn't equalize when I left them both open. And I do have a valve at the end.. Have had a previous rv and know all to well about taking the cap off.
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Brian & Pam
2017 305RL High Country
2005 F-350 Lariat
6.0 Power Stroke Diesel
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