Texas Tradesman Plumber-Limited License Practice Exam 2026 - Free Plumber License Practice Questions and Study Guide

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What is the primary purpose of a plumbing trap?

To provide access for cleaning

To prevent sewer gases from entering a building

The primary purpose of a plumbing trap is to prevent sewer gases from entering a building. Plumbing traps create a water seal that serves as a barrier between the sewer system and the living space, effectively blocking noxious gases such as methane and hydrogen sulfide that could pose health risks. When water sits in the trap, it retains enough liquid to hold back these gases while still allowing wastewater to flow through.

This function is crucial in maintaining indoor air quality and ensuring the safety and comfort of occupants. While some traps can provide access for cleaning or might have an impact on water flow, those are secondary functions that do not encompass the primary purpose of a trap within a plumbing system. Similarly, while some filtration may occur in the process, the main goal is the effective prevention of sewer gases from infiltrating the indoor environment.

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To regulate water flow

To filter contaminants from water

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