General purpose mechanical seal for use in centrifugal pumps and other equipment with rotating shaft handling water, oils, fuels, mild chemicals and liquids containing abrasives. Type USO 2.0 seal with conical spring is dependent on the direction of the shaft rotation. Looking at the sliding face of the rotating seal ring, a righthanded shaft rotation needs a right handed spring (USO 2.0R) and vice-versa (USO 2.0L).