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: I am moving a washer from the basement to the first floor. I ran a 1 1/2" drain approx 30' to the existing utility tub in the basement. I installed no trap or vent because i am going into a utility tub. Before i close up the wall, is 1 1/2" large enough? NO. Washers require a 2" drainage line. Indirect waste should be on the same floor. You still need a p-trap and vent. This is a really bad install and I would rethink the whole thing before I closed up the wall. If you decide to go with this, check your homeowner's insurance to see if it covers flooding caused by incorrect, unpermitted, uninspected plumbing. Deb The Pipewench
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