I had a first floor laundry in the last house as well, and the hose came loose out of the drain pipe while I was doing laundry one day. It flooded part of the first floor and a good portion of the basement, so things can go wrong at any time. I just like to prevent the ones that I can, especially when it is so easy to take precautions in some cases.
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Did/do you do anything to prevent this from happening again?