What is a trap in plumbing, and what is its function?

A trap in plumbing is specifically designed to prevent sewer gases from entering a building, serving as a critical component in maintaining indoor air quality and preventing foul odors. It accomplishes this by utilizing a curved section of pipe that retains a small amount of water, creating a seal. This water barrier blocks gases from the sewage system while still allowing wastewater to flow through.

The function of this seal is essential because it acts as a line of defense between the plumbing system and the inside of the building, ensuring that harmful gases, which can be toxic and cause health issues, do not escape into living spaces. Traps are found in various plumbing fixtures such as sinks, bathtubs, and toilets, highlighting their importance across the entire plumbing system. Understanding the role of traps can help plumbers maintain effective and safe drainage systems.