MS52000-1 SIZE 8S is a type of Accro Gasket, which is an electroform/laminate gasket. It is a spherically-contained nickel gasket with an aluminum core bonded to a perforated (corrugated) nickel foil. This gasket is rated at 22 pounds per sq. inch of differential pressure and is suitable for use in temperatures of -112°F to +550°F. It can accommodate a variety of environmental conditions, including vibration and shock loads, as well as flanges not perfectly parallel to one another. The size 8S gasket has an outside diameter of 0.625 inches and an inside diameter of 0.433 inches.