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I realize I should've asked a question, not added on to an existing question looking like an answer, whoops...

I am tapping into an existing 2" drain to add a washer, and the trap ended up pretty...

A follow-on to this question. I am tapping into an existing 2" drain to add a washer, and the trap ended up pretty high in the wall. What's the absolute minimum drop you would use from the box to...