I also have a 34E Hurricane, and when my 1/2 bath toilet backed up.....that is how I discovered that the kitchen sink is plumbed to the black tank for the 1/2 bath. I had been draining and flushing my water system, so that 1/2 bath black tank had filled up with the kitchen sink drain water, and when I went to flush the 1/2 toilet.....it would not empty! That's when I discovered how it was plumbed! I emptied the mid black tank....and all was good!
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