Luvmy5vrExplorerMay 09, 2016RV OdorWe purchased an older fifth wheel to use as a sleep camp. There is this musty/bad smell that is more prominent when I open the cabinet door under the bathroom sink as well as the cupboard under the k...Show More
Paul_ClancyExplorerMay 10, 2016If smell is under sink - almost certainly air admittance valve. I've replaced several over the years.