Those auto vents (air admittance valve) do fail from time to time, but it's not extremely common. Usually the first sign that it's failed is the odor you get. Rarely does it actually leak water out. Sometimes it will stick closed and then the sink will gurgle when trying to drain.
FYI, It's also common for the black tank flush, backflow preventer, to be installed in the cabinet with the sink.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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