Thanks for all the replies.
My vacuum breaker is under the sink in the bathroom so I know it is not leaking there.
The water only flowed out when I tired flushing the black tank and we had been in the park for 3 nights with no rain, so I know it wasn't road/rain water.
What I need is the...
I have a 2013 Hearland Northtrail 24RBS. The first time I used the black tank flush line it worked perfectly. The second time was after a few months and it didn't put any water in the tank. It seemed as if all the water was going to the underbelly. Does anyone have a schematic of the black...
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