Quote:
Originally Posted by davidspixx
The reason that they use the bathroom sink for the black tank, is that they both need roof vents. The blackwater vent passes near the sink, thus giving them both a common roof vent.
If you separate the drains, you will need to vent whichever now does not have a vent.
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Ummmm, no. You only need a roof vent for each tank. Sinks normally have Air Admittance Valves (AAV) these days.