Type M is the thinnest but is strong enough for most homes. Types L and Type K are thicker and used in outdoor and drain applications. To cut rigid copper, you’ll need a wheel cutter, tube cutter, or a hacksaw. Pipes are usually connected with soldered sweat fittings and compression fittings can connect the pipe to shut off valves.. Not all pipes are as useful or effective as others, and each type is used for a specific purpose in plumbing. PVC pipe is a type of plastic plumbing pipe primarily used to transport high pressured water. It is available in several standard sizes, ranging from inch . centimeters to inches . centimeters in diameter. PVC pipe is only .Plumbing pipes such as PEX, Copper, and PVC are used normally depending on their application and the location in which they are installed. In addition, there are some other plumbing pipe types such as black, galvanized and brass. Let’s see below the best application for the most common used plumbing pipes..When deciding to do your own plumbing, you face an array of plumbing supplies PEX, copper, PVC, cast iron, galvanized steel. Which to choose?.