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Water-gauge glass.

Municipal Code of Chicago § 18-28-1010.2.1
in effect
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18-28-1010.2.1 Water-gauge glass. The gauge glass shall be installed so that the midpoint is at the normal boiler water level. The lowest point of the gauge glass shall be a minimum of one inch above the lowest permissible water level recommended by the boiler manufacturer.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688656Fetched: 10/24/2026

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18-28-1010.2.1 | Corpus