Profile: DuctileIronPiping.Com specializes in providing ductile iron pipe, valves, joints and gaskets. Our ductile iron pipe is a durable pipe made from ductile cast iron. Protective interior linings and exterior coatings make these pipes used for transmission & distribution applications such as potable water and sewer lines. Flanges are flattened rings that will fit at the end of each pipe. Each pipe will have a flange that mates with an equivalent flange from the pipe that is to be connected with.