I'm helping a friend with his DWV layout.

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Looking for a Pro's view on whether we could use 1-1/2" vs 2" on the run from the 10"x12" (no disposal) bar (prep) sink to the 2" kitchen sink line.

Note, we have to transition five (5) 2x10 floor joists to access the 2" run. Technically 1-1/2" will work, just wondering what everyone's experience has shown.

Thanks,

Mario