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The Pipe Plug is an item addey by BuildCraft and is used, what the name says, to plug all types of pipes to prevent connections. For examples to prevent connections between similar pipes (Fluid Pipes for different fluids), Fluid Pipes and Tanks, Kinesis Pipes and energy consumer/producer, and Transport Pipes and chests. The Pipe Plug is thereby simply placed on the pipe, whereby the connection is interrupted. A few examples are shown in the image.