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Change in size.

Municipal Code of Chicago § 18-29-704.2
in effect
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18-29-704.2 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 (100 mm by 75 mm) water closet connection shall not be considered as a reduction in size.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692000Fetched: 10/24/2026

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18-29-704.2 | Corpus