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It's possible you might be ok draining the lines and blowing them out really well with an air compressor as others have done, but for my own peace of mind, I put the RV (pink) antifreeze in when temps drop down much below freezing. There are just so many areas that won't drain well and may retain some water even at an attempt to blow them out. The fresh water pump, traps and dump valves are critical points also.
It only takes a gallon or so and very little time to do it. Personally, I feel much safer doing it this way, especially if I will be storing it during some of the colder winter months when the temps get down in the 20s or teens.
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