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

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What is the function of a backflow preventer?

To increase water pressure

To prevent potable water contamination

A backflow preventer is a crucial device used in plumbing systems to ensure the safety of potable water. Its primary function is to prevent the reverse flow of contaminated water into the clean water supply, which can occur due to changes in pressure in the plumbing system. This is essential for protecting public health, as backflow can introduce harmful substances into drinking water.

The other options involve functions that do not relate to the purpose of a backflow preventer. Increasing water pressure, assisting with drainage, and regulating water temperature are roles that are fulfilled by different plumbing components and mechanisms, such as pressure regulators, drainage systems, and temperature mixing valves. Therefore, the focus of a backflow preventer is specifically on maintaining the purity of the potable water supply, thereby affirming its critical role in public health and safety.

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To help with drainage

To regulate water temperature

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