Black tank flush - valves always open?
The label next to the inlet for our black tank flush says that the drain should always be open for flushing. Why is this? Is this really a concern, or is this just there to make sure somebody doesn'...
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I have to agree, the only way out for the water is up and out the vent tube if it gets too full. Now that may be a mess but I see no way it will flood the inside of the RV unless the toilet flapper is not seated.
