Because of continuous and intense heat cycling, plastic coolant tanks have a reputation of failing over time. Fortunately, the rugged 2-piece Radium Engineering replacement is CNC machined from aluminum 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 applications. Included -2-Piece Billet Aluminum Tank -Aluminum Mounting Bracket -Aluminum Adapter Fittings -Overflow Hose, 7/32" -Stainless Steel Hardware