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Trap seals.

Municipal Code of Chicago § 18-29-1002.4
in effect
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18-29-1002.4 Trap seals. Each fixture shall have a liquid seal of not less than 2 inches (50 mm) and not more than 4 inches (100 mm), or deeper for special designs relating to accessible fixtures. Where a trap seal is subject to loss by evaporation, a deep-seal trap consisting of a 4-inch (100 mm) seal is required, or other means shall be provided to prevent loss of trap seal. Other means shall include: automatic trap seal primers conforming to ASSE 1018 or ASSE 1044, or vegetable or mineral oil added to the trap.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2692612Fetched: 10/24/2026

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18-29-1002.4 | Corpus