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Something else to add to your checklist, Check that the drainage plumbing is connected correctly as follows
Drain the grey and black tanks completely
Close the valves
Run a few gallons of water into all the sinks and the shower
Now go out and open the black water drain valve. Nothing should come out
Open the grey water valve and completely drain the grey tank and close the valves again
Now run a few gallons of water through the toilet.
Open the grey water drain valve and nothing should come out.
Open the black water drain valve and drain the tank. Close both valves.
Recently I came across a thread where the buyer of a new trailer had found crossed drain plumbing in his travel trailer. As unbelievable as this might seem at first, these trailers are assembled by people, and people make mistakes, especially when they're pushed as hard as the RV industry seems to push their assembly line workers.
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