Hydraulic backup rings or industrial gaskets are designed to be placed in the gap between the O-ring and the extrusion to prevent the O-ring from entering the gap and being squeezed and damaged under high pressure and a large gap. When the O-ring is pressed into the gap under high pressure or high temperature, it will wear out. As time passes, the O-ring will fail prematurely due to increasing wear. Using back up ring seal is the most economical and efficient way to solve this type of O-ring failure.