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Waste piping and trap.

Municipal Code of Chicago § 18-29-912.2
in effect
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18-29-912.2 Waste piping and trap. The waste piping and trap in a combination waste and an end vented (both ends) system shall be a minimum of 4 inch (100 mm) diameter. The waste piping and trap shall be at least two pipe increments larger than the pipe size required and at least two pipe increments larger than any fixture/appurtenance discharge tailpiece.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692512Fetched: 10/24/2026

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18-29-912.2 | Corpus