Omaha Journeyman Practice Test 2025 - Free Journeyman Practice Questions and Study Guide

Question: 1 / 400

Which is the primary purpose of a trap in plumbing systems?

Prevent backflow

Provide a water seal

A trap in plumbing systems serves a crucial function by providing a water seal. This water seal is essential for preventing sewer gases from entering the living spaces of a building. When water fills the trap, it creates a barrier that blocks the flow of gases. This is especially important for health and safety, as sewer gases can be harmful if they infiltrate the home.

In addition to maintaining a seal against gases, traps also catch debris, preventing it from moving further into the plumbing system, which can help in maintaining drainage efficiency. While other functions like preventing backflow, facilitating drainage, and minimizing noise may be relevant in plumbing systems, the primary and most critical function of a trap is indeed to provide that water seal. This seal protects the integrity of the indoor environment, making it the most significant purpose in the context of a plumbing system.

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Facilitate drainage

Minimize noise

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