While plumbing history does include clay, cast iron, and copper, as a title that may be a little misleading. Actually the progression is not really clay-cast-copper, and that sequence ignores many major historical plumbing types. The clay to cast to copper progression will work if we only consider the most frequently used materials for a period in history. Plumbers today have access to a wide range of modern materials, as well as clay, cast-iron, and copper. For whatever project you are planning, your local plumbing professional will be able to advise you on which material will work best for you.
