The present application includes and assembly having a dual dart assembly operable between an upper cage and a lower cage. The dual dart assembly is configured to connect an upper dart and a lower dart via a connecting rod. Therefore movement of one dart causes equal movement in the other dart. Movement of the dart is dampened upon impact at the top and bottom of the well by restriction of the working fluid as the dart assembly seats and unseats. A series of expandable seals are independently operated around the outer body and configured to expand and contact the outer wall in response to pressure increases within the outer body.