Red Seal Plumbing Complete 2025 Practice Exam

Question: 1 / 400

What component of a grease interceptor prevents the passage of sewer gas?

Flywheel

Deep seal P trap

A A flywheel is a mechanical component used to store rotational energy in many machines and does not have any relation to preventing sewer gas from passing.

C: A filter screen, while it may filter out solid debris, does not stop sewer gas from passing.

D: A closure device is a mechanical piece used to seal off a container or cylinder and does not have any relation to preventing sewer gas from passing.

The correct answer, B, is a deep seal P trap. This component is designed to create a water barrier within the grease interceptor, preventing the passage of sewer gas. Without this barrier, sewer gas could potentially escape through the grease interceptor and into the building's plumbing system, causing unpleasant odors and health hazards.

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Filter screen

closure device

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