A plugging device for double blocking a section of pipeline or piping and method for its use includes a first and second sealing element and at least one cylinder that is extendable along an axial direction of the pipe between a retracted first position and an extended second position. A means for actuating the cylinder, such as a fluid power source, is provided. When the cylinder is in the extended second position, the sealing element sealably engages an opposing cut end of the pipe. The sealing element is an elastomeric sealing element and may be cup-shaped, convex-shaped, or cork-shaped.