Massachusetts Plumbers Journeyman Practice Exam 2026 - Free Plumber Journeyman Practice Questions and Study Guide

Question: 1 / 400

What is the maximum permitted distance from the fixture outlet to the trap weir?

12 inches

18 inches

24 inches

The maximum permitted distance from the fixture outlet to the trap weir is 24 inches. This measurement is critical to ensure that the trap can effectively maintain a seal and prevent sewer gases from entering the living space.

When the distance is too great, there is a risk of insufficient water flow allowing the trap to dry out, which can compromise its function. The 24-inch maximum is established to help maintain an efficient drainage system while ensuring that traps are adequately filled and functioning as intended.

This specific distance aligns with plumbing codes that are designed to promote proper drainage and sanitation. Keeping the distance within this limit assists in achieving optimal performance in plumbing systems.

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30 inches

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