What is the function of a trap primer within a drainage system?

The primary function of a trap primer within a drainage system is to retain water in the trap. Traps are designed to hold a small amount of water, which creates a seal that prevents sewer gases from escaping into the building. Over time, water can evaporate from the trap, especially in fixtures that are infrequently used. The trap primer automatically adds water to the trap as needed, ensuring that the seal remains intact and minimizes the risk of sewer gases entering the living spaces.

In this context, the trap primer is essential for maintaining a functional drainage system. It serves to automatically replenish the water seal without requiring manual intervention or frequent use of the fixture. This function is particularly important for maintaining health and safety standards in plumbing systems, as the absence of water in the trap can lead to unpleasant odors and potential health hazards.

Other options may seem related to drainage systems but do not accurately describe the specific role of a trap primer. For example, while reducing odors from the sewer and preventing clogs are important aspects of plumbing, they do not define the specific function of a trap primer within the system.