What is a common component of a drainage system designed to prevent backflow?

A trap is a common component of a drainage system that is specifically designed to prevent backflow. It functions by holding a small amount of water within its curved section, creating a seal that blocks gases and odors from the sewer system from escaping back into the living space. This water barrier is crucial in maintaining a hygienic environment and preventing foul smells from infiltrating a home or building.

Traps are typically found in sinks, showers, and floor drains, ensuring that the waste system operates effectively while protecting occupants from harmful sewer gases. Their design is integral in both residential and commercial plumbing applications, as they maintain proper drainage while serving as a safeguard against backflow issues.