What is the purpose of a plumbing trap?

The purpose of a plumbing trap primarily centers on its role in preventing the backflow of sewage and gases from the plumbing system into occupied spaces. Traps are designed to create a seal of water that serves as a barrier against harmful sewer gases while also protecting against the ingress of wastewater that could lead to contamination or unpleasant odors in living areas.

In a typical plumbing system, when water is used, it flows through the trap, allowing waste to pass while simultaneously maintaining that crucial water barrier. This function is vital for health and safety, which is why plumbing codes and regulations have specific requirements regarding the installation and maintenance of traps in various plumbing fixtures. Overall, traps are a fundamental part of plumbing that ensures a sanitary and safe environment, effectively preventing the undesired backflow of sewage.