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I'm new to the forum, but I've had a lot of Rv's. I've always done the bypass/pink stuff until this one. The dealer in Minot ND said they will ONLY winterize with air. 60 psi for 30 min or so until no water is spitting from anything. (Don't forget the outside shower). I have an adapter from my air hose to water hose with a regulator at the air source. Attach to the city water inlet. Drain the water tank and the hot water heater, replace the drain plugs and turn on the air. I have done this twice thru two Montana winters and it seems to work fine with a lot less work, especially in the spring when you de-winterize.
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