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P3005.1.6 Drainage Piping Size Reduction in the Direction of Flow
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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 a reduction in size in the direction of flow:
- A 4-inch by 3-inch (102 mm by 76 mm) water closet flange.
- 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.
- An offset closet flange.
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