Rhode Island Journeyman Plumber Practice Exam 2025 - Free Journeyman Plumber Practice Questions and Study Guide

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What is the minimum size for wet vent piping?

1/4" OD

1/2" OD

The minimum size for wet vent piping is 1/2" OD because this size provides adequate flow capacity and drainage functionality for the fixtures connected to it. Wet venting is a configuration that allows a horizontal waste pipe to also serve the purpose of a vent for multiple fixtures, reducing the number of individual vent pipes required in a plumbing system.

Using a size larger than 1/2" would not be necessary for most applications and could lead to complications with drainage and venting efficiency. Smaller sizes like 1/4" or 3/4" may not properly facilitate the necessary airflow and drainage, which can cause issues such as siphoning or inadequate venting. The standard requirement for a 1/2" OD pipe aligns with plumbing codes meant to ensure proper performance and safety in drainage and venting systems.

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3/4" OD

1" OD

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