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How to keep an rv water hose from freezing
Fill your fresh water holding tank with water, about 3/4 of the way full.
Having fresh water in your tank ensures you will have ample fresh water supplies after disconnecting your water hose, but by only filling 3/4 of the way, you leave room in the tank for expansion.
Disconnect your rv water hose.
Detach it from the rv connection and water supply line. Place it in a covered area away from cold.