Galvanized pipe is found primarily in older homes. PVC pipe is not considered to be as dependable as copper or galvanized pipe, and is usually only used for systems that are not under constant pressure, such as sprinkler systems. ABS pipe is the pipe proffered in most new construction because of its low cost and ease of installation. Cast iron pipe, while most often found in older homes, is still used today for more expensive homes because it is quieter than ABS pipe, and therefore you will not hear the sound of water flowing through it. Galvanized pipe is sometimes used in conjunction with cast iron pipe for vents and smaller drain lines.
Plumbers use a variety of specialized tools.
For sweating copper pipes. Typically ABS and PVC pipe do not require much in the way of specialized tools other that their respective glues for joining the pipe and a handsaw for cutting it. Cast iron pipe however is cut in a very special way. Usually the tool can be rented at home centers and it is worth the effort of doing so as it can be difficult to get an accurate cut with a reciprocating saw. Your shopping list will depend on your specific plumbing project .