What is the purpose of a trap in plumbing systems?

• A. To allow easy access for cleaning
• B. To create a vacuum seal
• C. To prevent sewer gases from entering buildings
• D. To enhance water pressure

Answer: (C)

The purpose of a trap in plumbing systems is primarily to prevent sewer gases from entering buildings. Traps are designed to hold a small amount of water at all times, creating a barrier that blocks the gases from the sewer or septic system. This water seal is critical for maintaining indoor air quality and ensuring that the harmful and unpleasant odors associated with sewer gases do not infiltrate living or working spaces.

While easy access for cleaning, vacuum sealing, and enhancing water pressure may be considerations in plumbing design and functionality, they do not accurately represent the main function of a trap. The trap's water seal is an essential safety feature that protects the home from potential health hazards associated with exposure to toxic gases.