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I have a 2955 and have been concerned about the water between the holding tank and the pump and the line between the check valve and the pump for the external pressure side. It looks like water there would give you trouble as far as freezing. I have the by pass and it works like a charm but it looks like the other 2 lines don't get any protection just using that. I bought the little fitting from Camping World for the outside hose attachment and blew air through the pressure side and put the antifreeze in the fresh water holding tank and pumped it through just to be safe
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