This fabricated aluminum supercharger coolant tank is compatible as a replacement for GM #TK400025. It's a direct bolt-in replacement. The plastic factory tank can crack or deform over time from repeated high heat, fabricated aluminum won't. This tank can be polished, chromed, powder coated or left as-is for a race look. It can also be packed with ice for the track or dyno pulls for quicker E.T.s and more horsepower. It has an easy to turn, see through screw on cap that makes checking fluid and ice levels simple. Mounting hardware included.