Red Seal Plumbing Practice Exam 2025 - Free Red Seal Plumbing Practice Questions and Study Guide

A dual check valve backflow preventer is a mechanical device that ensures the flow of water in a piping system only goes in one direction, preventing any backflow and contamination of the water supply. The key feature of a dual check valve backflow preventer is that it has two independently acting check valves, providing an extra layer of protection compared to a single check valve backflow preventer.

Option A, "For industrial applications", is incorrect because a dual check valve backflow preventer can be used in a variety of settings, including residential and commercial applications.

Option B, "For public water systems", is incorrect because a dual check valve backflow preventer can be used in both public and private water systems.

Option D, "Used for major hazards only", is incorrect because a dual check valve backflow preventer is effective at preventing backflow, regardless of the severity of the hazard