I sometimes get that smell, even after sealing my washer trap, when I am dumping. My guess is that big whoosh you get dumping the tanks sometimes sucks the water from the p traps. I run some water in all the drains and it seems to go away. DW especially complains when I dump and also have the vent fans going which seems to pull in more of the "foul wind".
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Dave & Debbie
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