EXPANSION TANK CAP; Atlas Cross Sport. EXPANSION TANK CAP; Atlas. A cover that prevents foreign debris from entering the container. Cap for the Hybrid Inverter Coolant Reservoir. From 03/13/2017. From 05/26/2017. From 11/27/2017. Includes: Expansion Tank Cap Seal. Includes: Seal. Includes: Seal. Location-Reservoir. Radiator Cap. To 11/26/2017. Cover. Drive Motor Inverter. Engine. Radiator. Included with: Reservoir.