Quote:
Originally Posted by Beau388
It so you can travel in freezing weather with water in the heated tanks and have that long line under the coach dry and not filled with ice when you go to dump.
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I think this is correct.
Traditionally toilets were more often installed on driver side of coach with black tank directly under it so discharge line was very short, but full wall slides (commonly on driver side) make that difficult, so many newer floorplans have toilet on passenger side. That makes a longer cross-coach discharge line necessary, and they add a second valve at the tank.
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