Illinois Plumbing Code Practice Exam 2026 – All-in-One Guide for Exam Success!

Question: 1 / 400

True or False: According to the Illinois Plumbing Code, all main vents or vent stacks must connect full-size at their base to the building drain or to the main soil or waste pipe above the lowest fixture branch.

True

The statement is correct because the Illinois Plumbing Code mandates that all main vents or vent stacks should connect at their base to the building drain or to the main soil or waste pipe situated above the lowest fixture branch. This requirement helps ensure that there is effective venting and that the plumbing system maintains proper air circulation, preventing any potential issues such as siphoning of traps or buildup of harmful sewer gases. A full-size connection at the base is crucial for maintaining these functions, as it allows for adequate air flow and pressure equalization within the drainage system. This connection also supports the overall efficiency of the plumbing system, ensuring that it operates safely and effectively in accordance with building and health standards.

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False

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