My Northpoint drain valves are kinda low and I run into the same situation at times. I pull the valves and the tanks fully drain but there is leftover in the drain lines and the sewer hose. If I'm at a full hook up for a length of time and have to drain the tank(s) a couple times during my stay, whatever drains out of the tanks is what drains out and whatever is left in the hose stays in there until I have to drain again. For me, it's always grey water that's going to be in there so it not a big deal.
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2017 North Point 375BHFS
2015 Silverado 3500HD Crew Dually Dmax 4x4
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