Abstract: A pipeline plug having a seal assembly and a slip assembly coupled to the seal assembly. The slip assembly moves from a retracted position to an expanded position when the seal assembly moves from a disengaged position to an engaged position. The slip assembly frictionally engages the internal wall of a pipe when in the expanded position. The force exerted on the pipeline plug by fluid within the pipe increases the force by which the slip assembly engages the internal wall of the pipe. The plug is removable from the pipe without damaging the plug by moving the seal assembly back to the disengaged position. A method of sealing a pipeline using the pipeline plug.