Winterize position. Happens exactly as you describe. In error, after filling my fresh water tank, I've flipped mine many, many times and was bewildered every time why. Your situation sounds identical. Flip the winterization valve.
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History is not about the past, it's an explanation of the present.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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