What is the function of a trap in plumbing fixtures?

The function of a trap in plumbing fixtures is primarily to prevent sewer gases from entering the building. A trap is a curved section of pipe that holds a small amount of water, creating a barrier that blocks harmful gases from the sewage system. This water seal is crucial because it ensures that unpleasant and potentially dangerous gases, which can contain harmful substances, do not escape from the drainage system into the living spaces of a building.

By maintaining this water barrier, traps not only contribute to health and safety but also help maintain odors associated with the sewage system. Ensuring that these gases are contained helps create a more sanitary and pleasant environment in homes and buildings.

In contrast, while filtering impurities or providing access for cleaning may be considerations in plumbing design, they are not the primary functions of traps. Regulation of water pressure is also unrelated to the function of traps in plumbing systems.