We used to have a terrible smell coming from the grey tank. If you follow the main drain from the bathroom, there is a in line piece, about six inches long. I dont remember what it was called. Mine was right at the other side of the basement wall. almost right behind the convenience center. Although a friend of ours with a Montana, theres was about 15 feet away. It is used instead of a trap for the shower. There is a rubber sleeve inside and mine was turned inside out. If accessible, easely removable. Just clean it and stuff the sleeve back in . Our stink immediately went away. Hope this helps.
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