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My 07 jayco 25z has a problem with water being left in line during dumping. I believe it to be not enough fall between valves and the end. I do have the twist on valve for the end but like most my clearance dosnt allow it to be left on. So how I handle it now is dump black tank then back flush a few times then I dump grey and flush back a few times and lastly I leave my cap off until I get the camper back home. Any water sitting in that line will be out by then. So there won't be any surprises the next time you remove that cap!
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