What is the role of a trap in plumbing systems?

The role of a trap in plumbing systems is to prevent sewer gases from entering a building. Traps are designed to hold a small amount of water, creating a seal that blocks gases and odors from the sewage system. This seal is essential for maintaining indoor air quality and ensuring the safety of the occupants. Traps are commonly found in sinks, toilet fixtures, and floor drains. The water barrier effectively prevents harmful gases, such as methane or hydrogen sulfide, from escaping into living spaces, thus providing both health and comfort to homeowners.

While structural support, connections to water sources, and regulation of water pressure are all important aspects of plumbing systems, they are not the primary function of a trap. Their design and purpose are specifically to maintain an effective barrier against sewer gases.