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

The role of a trap in a plumbing system is primarily to prevent sewer gases from entering the building. Traps are designed to hold a small amount of water, creating a barrier between the interior of the dwelling and the sewer line. This water seal prevents the noxious gases and odors from the sewage system from passing back into the living spaces.

Traps are integral components of drainage systems and are typically found in various plumbing fixtures such as sinks, toilets, and floor drains. They not only serve to block gases but also help in trapping debris, which can assist in preventing clogs further down the plumbing line, enhancing the overall efficiency of the drainage system.

In contrast to other options, the trap is not designed to simply allow drainage, filter solid waste, or increase water pressure. Its core function centers around maintaining air quality and safety within the building by blocking harmful sewer gases.