What is the purpose of a trap primer?

The purpose of a trap primer is to provide water to a trap periodically to maintain the water seal. Traps, such as those found in sinks and floor drains, are designed to hold a small amount of water, which prevents sewer gases from entering the living space. Over time, water in these traps can evaporate, especially in infrequently used fixtures. A trap primer automatically introduces water into the trap as needed, ensuring that the water seal stays intact and effectively controls odors from the sewer system.

Understanding the function of a trap primer is essential for maintaining a safe and sanitary plumbing system, as an effective water seal is necessary to prevent the intrusion of harmful gases. This mechanism is critical in scenarios where traps might not retain their water seal due to regular evaporation or infrequent use, ensuring that plumbing fixtures operate correctly and safely.