Cast iron pipes are heavier than any other pipes and normally used for water distribution systems or underground installation as the main pipe on drainage or sewer systems. The smallest size that normally is manufactured is 4-inch pipe, large enough to be used on residential applications, though no-hub piping is available in sizes ranging from 1 1/2 inches to 15 inches and bell and spigot piping is made in sizes between 2 and 15 inches. Cast iron pipe is heavy and must be supported while you assemble a joint.
