Arizona Plumbing Practice Exam 2025 - Free Plumbing Practice Questions and Study Guide

Question: 1 / 400

What is the minimum horizontal developed length required between the outlet of a water closet and the connection to a double sanitary tee?

12 inches

18 inches

The minimum horizontal developed length required between the outlet of a water closet and the connection to a double sanitary tee is specified to be 18 inches. This requirement is in place to ensure proper drainage and prevent potential clogs. Having a minimum length allows for adequate flow and ventilation of the wastewater, reducing the risk of backup or odors within the plumbing system. The 18-inch standard is also designed to allow for proper alignment and function of the plumbing fixtures and connections, ensuring that there is enough space to facilitate smooth flow and minimize turbulence. By establishing this distance, it helps to maintain system efficiency and longevity. Compliance with this requirement is essential for meeting plumbing codes and ensuring effective waste management in residential and commercial settings.

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24 inches

30 inches

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