Overflowing Shower/Lavatory Drain - I've tried everything
Hello all,
I bought a used 06 Montana Mountaineer 329RLS recently. The lavatory (sink/shower) seems to not want to drain properly. When I run either the sink or the shower, water backs up into the tub basin and doesn't drain at all. The grey tank is empty. I've tried the baking soda and vinegar thing, that didn't work. I removed the P trap under the tub, it is clear of obstructions. I snaked the drain after the trap all the way to the tank. (my entire 15' drain snake). I thought it might be the inline vent, but there doesn't seem to be one on the bathroom plumbing like there is in the kitchen. i cleaned some mud dauber nests out of the grey tank roof vent, that did't seem to help either. What could I be missing? Thanks in advance for any advice.
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