A damper including inner and outer tubes is provided. A piston is slidably disposed within the inner tube. An intermediate tube is positioned radially between the inner and outer tubes. An intermediate channel is disposed radially between the intermediate and inner tubes. A slanted elliptical seal is positioned at an oblique angle relative to a longitudinal axis of the inner tube and divides the intermediate channel into first and second intermediate channel portions. A first control valve is in fluid communication with the second intermediate channel portion via a first intermediate tube opening. A second control valve is in fluid communication with the first intermediate channel portion via a second intermediate tube opening.