Arizona Plumbing Practice Exam 2026 – Complete Preparation Guide

Black iron pipe is commonly used for gas distribution in Arizona due to its durability and ability to withstand high pressure, making it an ideal choice for gas applications. This type of pipe is specifically designed to handle natural gas and propane, as it can safely transport these gases without risk of deterioration or leakage.

In contrast, copper is usually used for water supply lines and not generally employed for gas distribution due to its higher cost and potential for corrosion when exposed to certain gases. PVC, while popular for drainage and irrigation, is unsuitable for gas lines because it is not rated for the pressures and temperatures that gas can exert and can become brittle over time. PEX is versatile for water and heating applications but is not approved for gas distribution due to materials that are not compatible with gas transport and potential safety issues. Therefore, black iron remains the standard and safe choice for gas lines in plumbing applications.