Pipe fittings, also known as pipe connectors, attach one pipe to another in order to lengthen the run or change the flow direction in a plumbing system. These are used to combine, divert or reduce the flow of the water supply, and they come in a variety of sizes to fit the pipe they will connect. Brass is more malleable than steel or iron. It is susceptible to be bent, shape or mold than other metals. This makes it easier to cast into fittings of different sizes and shapes for plumbing. It means lower cost!