Iron Pipe

The iron pipe has up to five inputs and one output. It will send all incoming items in one direction. The direction can be changed by right-clicking the pipe in 1.7.3.x or right-clicking the pipe with a wrench in 2.0.x. The output direction can also be changed by redstone current. Every time it either loses or gains redstone power, it will cycle to a different output. However, it will never output to a wood pipe. This combination of properties allows for players to accurately control its output direction from afar, via redstone wiring. The iron pipe will pop out blocks if they try to go through the barrier that makes them go the correct direction as of 2.0.

Iron Pipes will occasionally bug when they have more than 2 aditional pipes connected. This bug presents itself as the pipe visually showing it will allow items to pass through in a direction, but instead the items either bounce back the way they came or move off in one of the blocked direstions.

Iron pipes can be waterproofed.

Recipe:
The iron pipe is crafted out of 2 iron ingots and 1 glass.