I have the 395 and in my connecitons cabinet I have the black drain for the master bath along with the grey for the master bath as well. Under the slide that black handle seems to be for the half bath and kitchen sink also drains into that tank. It just seemed to me that a black tank should only be for your sewage, but it looks like the kitchen sink dumps into that second black tank as well. I have monitored my tanks on several trips and the half bath does not get used as much as the kitchen sink and that tank tends to fill up rather quickly for being just the half bath.
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2014 Fuzion FZ 395
2016 Ram 3500 Dually 6.7 Cummins, 6 Speed Manual
2009 EZ Go electric 6 inch lift
The finer things in life.
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