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Aluminum tube.

Municipal Code of Chicago § 18-28-1107.4.5
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18-28-1107.4.5 Aluminum tube. Type 3003-0 aluminum tubing with high-pressure fittings shall not be used with methyl chloride and other refrigerants known to attack aluminum.
Source: City of Chicago, Municipal Code of Chicago (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2688944Fetched: 10/24/2026

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18-28-1107.4.5 | Corpus