When you open low point drains to drain th water in the lines, also open all the faucets in the kitchen, vanity, and shower. That allows air into the lines and helps the water drain faster.
Also, DavidEm above talked about winterizing using compressed air. That is the only way I do it. Blows all the air out of the lines. Don't forget to also winterize the outside shower. nRemember to pour some RV antifreeze into all the traps in the shower drain and kitchen drain.
Those of you with residential refrigerators with ice makers, you'll need to check here on the forum. I'm clueless on how to winterize a residential refrigerator.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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