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I also just bought a 381th (last week in fact). Had the same questions when I went to dump for the first time (didn't help that camping world didn't close the valves!). There is some hope however in that there is a black tank flush line built into the unit (it is the bottom hose connection in the water panel below the city water and winterizing connections. If you leave some water in your fresh water tank you can use your onboard 12volt water pump to supply water via the wash down shower to the flush line via a short jumper hose (would be wise to have a check valve in place though). This allows you to quickly flush the black tank while at a public dump station without having to go thru the trouble of hooking up their flush hose which always has a flattened end on it doesn't it......
I plan to actually hard pipe in a jumper between the two ports using PVC and I will put some pictures out there once I get it done.
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