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What is the purpose of a trap primer in a plumbing system?

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A trap primer is a plumbing device that maintains the water seal in P-traps. It periodically releases small amounts of water into the trap, preventing the evaporation of the seal and ensuring effective protection against sewer gases entering the building.
Bettmann/Getty Images
Bettmann/Getty Images
What is the purpose of a trap primer in a plumbing system?
- To increase water pressure
- To maintain the water seal in a P-trap
- To add fragrance to wastewater
- To prevent freezing in cold climates
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