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Old 11-11-2018, 06:38 AM   #1
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Location: Mansfield, Ohio
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'18 Navion 24V Black Tank used for Toilet AND Sink?

I have discovered that the sink in my bathroom also goes
into my black tank.

Surprised to see this as I would imagine all sinks would
drain into the gray tank.

From what I can tell only my kitchen sink and shower go into
the gray tank.

Does anyone know why winnie would drain the bathroom
sink into the black tank instead of the gray tank?

Joe
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Old 11-11-2018, 10:09 AM   #2
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Many RV manufacturers do this. I suspect it's because the gray tank tends to fill up much faster than the black.
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Old 11-12-2018, 07:57 AM   #3
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I think it is pretty simple - most people do not use enough water when flushing the toilet in an RV. Adding water from sink (it is pretty small) along with soap residue, keeps the black tank materials liquid. Anyway, the black tank is bigger. We always fill up our gray tank well ahead of the black tank.
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Old 11-12-2018, 08:42 AM   #4
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Our 2018 View 24D has the bathroom sink draining to the black tank, too. Our first View, a 2006 23H, was plumbed that way, too. Donít recall how our 2012 Navion 24G was ...
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Old 11-13-2018, 06:21 PM   #5
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Thanks for the replies and great info!!

This is a very helpful group thanks!
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Old 11-13-2018, 09:29 PM   #6
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In our Minnie Winnie the bathroom vanity is directly over the black water tank. I'm thinking simple economics and ease of motorhome assembly here. Since bathroom sinks are not used much, I see no drawbacks to draining it into the black tank.
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Old 11-14-2018, 10:06 AM   #7
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I think that is common practice. Saves time and money on construction and puts more water into the usually under served black tank.
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Old 11-18-2018, 05:08 PM   #8
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I think my 2018 Travato does that as well. The Black and Grey tanks aren’t that big since it’s a class B. But that tends to make sense now.
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Old 11-19-2018, 07:57 AM   #9
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Actually this is beneficial especially when boondocking. If your gray water tank fills up faster than the black water tank you can use the bathroom sink instead of the kitchen for some or more of your cleaning needs which can extend your stay before dumping. My Itasca Spirit (Mini Winnie) is set up this way too. From a plumbing perspective, the black water tank is much closer to the bathroom sink and easier to connect.
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