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back on topic! inside one of the basement lockers there are two pipes, one from the black water tank 3", the other from the grey 2". these, at least on my RV connect to a central outlet, facing downwards, with a secure end cap. you connect a sewer hose(bit like a tumble dryer flexible outlet pipe, but hopefully stronger) from this to the dump point. there are valves on each tank outlet. you dump the black water first, then the grey water, which flushes the pipe. we also have a shower point in this locker, which is used to wash the end of the pipe. all done in very short time, no mess, no dirty hands. i have a clear adaptor between the main outlet and the sewer hose, which enables me to monitor what comes out. comforting to know the pipe is really empty when you disconnect. have to make sure valves are properly closed when finished, otherwise when you next remove the end cap you have a nasty surprise. only done this once, and fortunately was the grey water, not the black.
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