LION Mega-Seal Radiator and Block Seal is designed to provide superior stop leak properties using a variety of proven stop leak components as well as several detergents to provide optimum performance.


  • Provides exceptional stop leak properties
  • Safe for all engines: Cast Iron, Steel and Aluminum
  • Safe for all radiators: Copper, Brass, Aluminum and Plastic
  • Permanently seals leaks in engine block and heads
  • Seals cooling system components such as water pumps and thermostats
  • Seals leaks in radiator, heater core, and freeze plugs
  • Highly concentrated
  • Not compatible with standard anti-freeze (Read instructions before use.)

Available In

  • 8 Fl Oz Plastic Bottle, 12 per case (MS-660)
SKU: MS-660

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