Jim,
Is there any literature on the valve in your Thor "bag"? Yours is a newer model than mine and it only had the 2-way valve for Local (city supply) or Fresh Water (on-board water tank). If you don't have any literature then you might call the manufacturer's customer service.
Good luck,
__________________
Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")
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