What is the main purpose of a sewer line trap?

The main purpose of a sewer line trap is to prevent gases from the sewer line from entering the building's plumbing system. These traps are designed to hold a small amount of water, which acts as a barrier. By maintaining this water seal, the trap effectively blocks the unpleasant and potentially harmful gases, such as methane, from escaping into the living or working spaces. This function is essential for ensuring indoor air quality and protecting the health of building occupants.

While preventing contamination and regulating water flow are important aspects of plumbing systems, they do not capture the specific function of the trap as effectively as its role in gas prevention. Additionally, collecting debris is not a primary function of a sewer line trap; other components of the plumbing system, such as grease traps or catch basins, are more suited to that purpose. This focus on blocking harmful gases highlights the vital role traps play in maintaining a safe and functional plumbing system.