On our recent trip, we had an incident where the water was backing up into the bathroom sink. The bathroom gray sensor was not reading full, but by equalizing the bathroom and kitchen grays, the water level receded as expected. What surprised me though was that water was coming up into the bathroom sink and not the shower, which is at a much lower drain point.
I would not expect there to be, but is there a check valve in the shower drain or something that would have caused this behavior?
I would not expect there to be, but is there a check valve in the shower drain or something that would have caused this behavior?
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