02-21-2008, 02:09 AM
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Deity
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Join Date: Apr 2004
Location: Sharon, PA, USA.
Posts: 2,203
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2" is the correct size for the shower drain however the sink drain line would depend upon which code you are under.
Under the IRC (International Residential Code) a kitchen sink requires an 1-1/2" drain line.
Under the UPC (Uniform Plumbing Code) a kitchen sink waste arm (the section extending out of the wall) should be 1-1/2" but all concealed piping in the wall must be 2".
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