I’d bet you have dual 44 gallon grey water tanks.. their spec sheet on Keystone website shows 1 but it’s just not fathomable to me. I’ll bet if you look behind one of the tires or under carriage there will be another pull handle for an additional 44 gallon tank
The bathroom sink should be the only thing that is plumbed into black tank besides toilet. I’ve seen several that had to argue and get the plumbing corrected
Work with Keystone customer relations and hopefully they will work with you to correct the issue
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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