What is the function of a trap seal in plumbing?

The function of a trap seal in plumbing is primarily to prevent sewer gases from entering the building. Traps are curved sections of pipe that hold a small amount of water, which acts as a barrier between the living spaces of a building and the plumbing system. This water seal stops harmful and foul-smelling gases that can be present in the sewer system from rising up through the plumbing fixtures, such as sinks, toilets, and floor drains. The effectiveness of a trap seal relies on maintaining that water barrier, so it is crucial for health and safety within the home.

Other options, while related to plumbing, do not accurately represent the purpose of a trap seal. Allowing free flow of sewage, regulating temperature, and supporting the structural integrity of pipes are essential functions in plumbing systems but do not pertain specifically to the trap seal mechanism.