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Antisiphon devices.

Municipal Code of Chicago § 18-29-504.1
in effect
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18-29-504.1 Antisiphon devices. An approved means shall be provided to prevent siphoning of any storage water heater or tank. A cold water "dip" tube with a hole at the top or a vacuum relief valve installed in the cold water supply line above the top of the heater or tank shall be approved for this purpose. Such a device shall be installed on any water heater or heated water storage tank that supplies a water outlet below the level of the heater.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2691311Fetched: 10/24/2026

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18-29-504.1 | Corpus