What is the purpose of a trap in plumbing systems?

The purpose of a trap in plumbing systems is to prevent backflow and block sewer gases. Traps are designed as curved sections of pipe that hold a small amount of water, creating a seal. This water seal acts as a barrier to stop sewer gases from escaping into living spaces, which is essential for health and safety. The trap also allows wastewater to flow through while effectively blocking the odors and harmful gases from the sewer.

The structure of a trap ensures that it maintains this water seal under normal operating conditions. If a trap is not present or not functioning correctly, there's a risk of sewer gases infiltrating the building, which can pose serious health hazards and diminish air quality. Traps are a fundamental component in drain systems and help ensure that plumbing remains sanitary and safe for building occupants.