Toilets drain lines begin with a flange under the toilet. A flange is a tube with a flat circular base at one end with screw holes. The flange is pushed through a hole in the floor and connected to a 90 degree coupler. The coupling is connected to a drain line two inches in diameter. This sewer line is then attached to the existing sewer line (generally three or four inches in diameter) using a coupling with a two-inch pipe coming out to the side.
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