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One more thing i like to add to this winterizing list is. The little valve with a hose going to fill fresh water tank in the convenience compartment for filling fresh water tank must be winterized also. Was told by a service guy who does winterizing said when blowing out lines with air compressor, switch the valve to fill as if your filling your tank with water and blow that line out also. He told me even if you don't use that valve which i don't use he said the valve over time could leak and freeze that hose and bust and if at a later date decide to use that valve to fill tank ,could be a problem if the valve or line is busted.
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