Which statement about the rigid hard temper copper tubing for the water supply system is least true?

Rigid hard temper copper tubing is commonly used in plumbing systems for various applications, including water supply. One characteristic of this type of tubing is its availability in differing wall thicknesses, which ensures suitability for specific plumbing needs and pressures. However, the statement you identified as least true relates to its wall thickness options. While it is indeed manufactured with multiple wall thicknesses, the specific terminology and distinction may create some confusion, leading to variations in understanding its applications compared to other types of materials or specifications in plumbing.

The other statements highlight important features of rigid hard temper copper tubing. It is utilized for both hot and cold water systems due to its excellent thermal conductivity and durability under varying temperature conditions. Additionally, while it does not have a formal standardized color code specific to copper tubing itself, some trades may use color-coding systems for identification in practical use situations. Moreover, using rigid hard temper copper for gas applications is generally discouraged to avoid safety hazards. However, the most notable aspect in evaluating these statements is the incorrect assumption about the commonality and standardization regarding wall thicknesses, making that the least accurate description of rigid hard temper copper tubing.