Looks like it could be part of the Hepa valve. I think the reason they use it is because it prevents water from the tank from sloshing back into the shower if you are moving with a nearly full tank, something a p-trap wouldn't do. Not an issue with the sinks because they are physically higher.
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Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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