Massachusetts Plumbers Journeyman Practice Exam

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What is the purpose of an automatic trap-priming device for floor/trough drains?

  1. To increase water flow

  2. To save energy

  3. To prevent backflow

  4. To maintain water seal

The correct answer is: To maintain water seal

An automatic trap-priming device for floor/trough drains serves the purpose of maintaining the water seal in the trap. The water seal in a trap prevents sewer gases from entering the building, acting as a barrier between the plumbing system and the indoor environment. By automatically adding water to the trap when needed, the device ensures that the seal remains intact, thus protecting the occupants from potentially harmful sewer gases.

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