Dutchmen, sorry about the confusion. This vent is indeed on the outside and is on the outer wall directly outside the galley sink. Most of the odor is outside, but there is a definite stench inside, particularly under the sink immediately after we wash dishes or otherwise use the sink.
When I investigated my other drains, I found a waterless trap in the drain pipe going to the gray tanks. I assume there is a similar waterless trap in this drain pipe, but am unable to see the drain without removing some of the underbelly walls.
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Mike&Christi
2020 Montana HC 373RD
2020 Chev 3500HD, CC, DRW, Flatbed
TAMU '99
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