What is the purpose of a trap in a plumbing system?

The purpose of a trap in a plumbing system is to prevent sewer gases from entering the living space. A trap is a curved section of pipe that holds a small amount of water, creating a barrier or seal. This seal is effective in blocking the passage of foul-smelling gases and harmful bacteria from the drainage system into the home. It ensures that occupants are protected from the hazards associated with sewer gases, which can be toxic and pose significant health risks. Proper installation and maintenance of traps are crucial for maintaining indoor air quality and preventing unpleasant odors.