Originally Posted by Mmnsc
The valve that was giving me the trouble and smell did not appear to have any moving parts. Although I thought the washing machine water was going into the grey tank we still had the smell like it was coming from the black water tank (pretty nasty). Once the back flow preventer valve was located and the dealer changed the back flow preventer valve the smell went away. Apparently the grey water tank develops foul odors from food remnants etc that go down the drains in the kitchen and bath. I hope you find the solution to your problem quickly as we know how unpleasant it can be. Good luck
Did they have to remove the washer to replace?
I hate to cut up the wall inside the vanity on a goose chase.