Why would you use copper DWV?
"The smaller diameter of DWV tube and fittings makes it possible to install copper drainage systems where other competing piping materials would be impossible, difficult or more costly. For example, a 3-inch copper stack has only a 3-3/8-inch outside diameter at the fitting and can be installed in a 3-1/2 inch cavity wall." Copper Development Association
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Why do we ream copper pipe ( or any pipe for that matter)?
Erosion corrosion.
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