The Iron Transport Pipe allows five incoming pipes to output to one direction. This direction, which is indicated by the non-transparent side of the pipe, can be changed with a Wrench or with a Redstone signal. Each signal will cycle the output direction through all attached pipes, except through Wooden Transport Pipes. The Iron Transport Pipe is useful for combining multiple piping systems into one pipeline, such as when combining the outputs of multiple quarries to one sorting system pipeline.