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

The correct choice is the air gap, which plays a crucial role in protecting the water connection to a bidet. An air gap creates a physical separation between the end of the water supply pipe and the flood level of the bidet. This separation ensures that if there are fluctuations in water pressure or a backflow event, contaminated water cannot siphon back into the clean water supply. The air gap acts as a safeguard, preventing any potential cross-connections that could compromise the safety of the potable water system.

In plumbing systems, maintaining the integrity of the water supply is essential. While other options like backflow preventers are used in various applications to prevent reverse flow, the air gap is uniquely effective for bidets as it guarantees that there is no risk of contamination through back pressure or siphoning caused by other plumbing issues, thus maintaining the health and safety standards required for drinking water systems.