there’s a flap that is supposed to only allow stuff ou
Did not know that was a thing. Learn something new every day.
In my case, depending on where that is and if my setup even has one, I doubt it’s the case. My house is also on a hill above the street/sewer connection and pretty much goes downhill from the time it exits the house. If sewer levels rise that high, the whole neighborhood is going to be in deep…well, you know. lol