Which statement is MOST false regarding cast iron pipes?

The statement that cast iron pipes come in six-foot lengths is the most inaccurate when considering the range of lengths available. While cast iron pipes are indeed frequently produced in certain lengths, they can also be found in various other lengths, such as 10 feet and 20 feet, depending on the manufacturer and the application's requirements.

Cast iron pipes are widely used in drainage systems due to their strength, durability, and ability to withstand heavy loads, which makes them a reliable choice for such applications. Additionally, while they are susceptible to rust and corrosion over time, particularly if not properly maintained, the material is generally more resistant than other metals when used correctly, especially in the context of sanitary and stormwater drainage. This offers a robust option for plumbing systems when selecting materials.

Therefore, although there are typical lengths that cast iron pipes may be manufactured in, stating they strictly come in six-foot lengths is misleading, making it the least accurate among the given statements.