Diluted RV Antifreeze
RV antifreeze is cheap, but I've always wondered if you diluted the antifreeze with 25% or 30% water, at what temp would it begin to freeze, and fail to protect RV plumbing? Walmart's SuperTech RV ...
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Just bring along 2-3 extra gallons of rv antifreeze and use that to flush until you get south far enough.
