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The size of the drainage piping shall not be reduced in the direction of the flow. The following shall not be considered as a reduction in size in the direction of flow:
  1. A 4-inch by 3-inch (102 mm by 76 mm) water closet flange.
  2. A water closet bend fitting having a 4-inch (102 mm) inlet and a 3-inch (76 mm) outlet provided that the 4-inch leg of the fitting is upright and below, but not necessarily directly connected to, the water closet flange.
  3. An offset closet flange.

Related Code Sections

704.2 Sanitary Drainage, Reduction in Pipe Size in the Direction of Flow
The size of the drainage piping shall not be reduced in the direction of the flow. The following shall not be considered as a reduction in size ...
704.2 Sanitary Drainage, Change in Size
The size of the drainage piping shall not be reduced in size in the direction of the flow. A 4-inch by 3-inch (102 mm by 76 mm) water closet ...
704.2 Sanitary Drainage, Change in Size
The size of the drainage piping shall not be reduced in size in the direction of the flow. A 4-inch by 3-inch (102 mm by 76 mm) water closet ...
P3005.1.6 Sanitary Drainage, Change in Size
The size of the drainage piping shall not be reduced in size in the direction of the flow. A 4-inch by 3-inch (102 mm by 76 mm) water closet ...
1101.5 Storm Drainage, Change in Size
The size of a drainage pipe shall not be reduced in the direction of flow ...