What size pipe for toilet drain?

What size pipe for toilet drain?

The wider the pipe, the more waste it can move and the less likely it will be to clog. A 4-inch pipe for a toilet is recommended and can carry about twice the waste of a 3-inch drain. The toilet flange is the fitting that attaches the toilet to the drain line. Flanges are available in a variety of configurations to allow the toilet and drain to attach securely. The diameter of the waste outlet for the toilet may not match the drain pipe.

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