What is a common characteristic of water valves that are 2-1/2 inches and larger regarding their body material?

Water valves that are 2-1/2 inches and larger are commonly constructed from cast iron. This material is favored for its strength, durability, and ability to withstand the pressure and stresses involved in plumbing systems. Cast iron valves also provide excellent resistance to corrosion, which is essential in maintaining the longevity and reliability of the valve in various environments, especially where water quality could lead to deterioration over time.

In larger applications, such as those found in commercial plumbing or industrial settings, the robustness of cast iron makes it a preferred choice because it can handle greater flow rates and pressures effectively. Its weight and structural integrity also contribute to the stability of installations at these sizes.

While plastic is used for smaller valves due to its light weight and cost-effectiveness, it wouldn't typically be suitable for larger valves that need to endure significant mechanical stresses. Copper is also a valuable material in plumbing for its corrosion resistance but is more common in smaller sizes due to cost and practicality in large volumes. Therefore, the characteristic of larger water valves being made from cast iron aligns perfectly with industry standards and practices.