As BLW2.stated check the anti-siphon vent on the bathroom sink. Not sure about the KT but my ND black tank vent is shared with the kitchen and bathroom sinks. I can see where that valve could cause odor if it was malfunctioning.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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