My shasta oasis 18bh all ways had a sewer smell. I thought it was normal. I never had a camper with a bathroom. This year the smell was extra bad It's so i investigated it today. Tore open The wall and the black tank vent was just an open pipe in the wall. Don't know how that was missed at the factory.
Welcome to the forum its a great place to get your questions answered. Boy that was a stinker on the factory's part. Is there a roof opening that they didn't connect?
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho