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My vote is for the pink, not air. One reason is that you can't use air to blow out your holding tanks, just hope they are empty, which most still hold a little. The second reason is once your have a RV washer/dryer you will have to start using pink RV antifreeze anyway.
I just figure 3 or 4 gallons ($8 or $10) isn't much to spend in order to winterize. Of course I never have to winterize anything anymore so my northern brothers may have more updated advise.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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