The Iron Fluid Pipe is a fluid pipe added by BuildCraft. It allows five incoming pipes to output liquids to one direction. This direction can be changed with a BuildCraft Wrench. Each use will cycle the output direction through attached pipes, except through Wooden Fluid Pipes. The Iron Fluid Pipe is useful for combining multiple piping systems into one pipeline, such as combining the outputs of multiple quarries to one sorting system pipeline.
Different liquids will not mix together in the same pipe, so while one liquid passes through the Iron Fluid Pipe, the other liquids will backup until the Iron Fluid Pipe is empty before moving forward.