The Primary Mechanical Shoe Seal (MS6) has been used on different tanks types, containing the full range of Crude and Refined products. The seal is suitable for welded and riveted tanks with wide variations in rim spaces. All mechanical seal components are easily accessible allowing installation with the tank remaining ″in-service". No welding or flame cutting is required to install or maintain the shoes. All components are pinned or bolted with corrosion resistant fasteners.