How does a plumbing trap function?

A plumbing trap functions by holding a small amount of water, which creates a seal that prevents sewer gases from entering the living space. This is crucial in maintaining indoor air quality and safety because sewer gases can be harmful to inhabitants. The design of the trap allows it to retain water even when plumbing fixtures are not being used, ensuring a continuous barrier is maintained.

The ability of traps to prevent odors and harmful gases from escaping is fundamental to the plumbing system's operation. They are typically found in drains for sinks, bathtubs, and toilets, and must be regularly checked to ensure they are functioning correctly. Without this water seal, dangerous gases could infiltrate the home, leading to health risks.

While other aspects of plumbing systems such as pressure and flow direction are important, the primary function of the trap is distinctly about creating that essential seal to protect occupants from sewer gases.