On Mon, 04 Jul 2005 19:01:32 GMT, in alt.home.repair Pipe
diameter volume "George E. Cawthon"
wrote:

Actually it is the 4" pipe is 2x2x3.14= 12.6
and 6" pipe is 3x3x3.14= 28.3

The answer is that a single 6" pipe has a larger
area than two 4" pipes.

And the 6" pipe will be less likely to clog than the two 4" pipes.

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