ON THIS WIKI
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For example, iron pipes have one output port and many input ports. In order to change which port is the output, you need a Wrench. The output is indicated by the port that does not have a little gray rectangle on it.
Wrenches are also very helpful when you discover that you placed something the wrong way. Each time the wrench is used the target engine/pipe will cycle through valid orientations. This means for example wooden conductive pipes have to be placed before attempting to rotate an engine or it will not move.
UsageWrench (BuildCraft) can be used to create the following items: