Radium Coolant Expansion Tank Kit - Toyota GR Corolla GZEA14R 23+Because of continuous and intense heat cycling with track use, plastic coolant tanks have a reputation of failing over time. Fortunately, the rugged 2 piece Radium Engineering replacement is CNC machined and anodized for increased longevity. And because aluminum is a superior thermal conductor material, heat transfer is further improved. Additionally, the metal construction is robust enough to use in racing application. This kit directly replaces the