Radiator Stop Leak

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SKU: 420 Category:


Five Star Radiator Stop Leak is formulated to seal leaks in an engine block, head gasket, radiator core, soft plugs & heater core.Five Star Radiator Stop Leak will stop rust & corrosion in a cooling system & lubricate water pumps, prevent squeaking & extend the water pumps life.


Directions for Use

Check radiator level to make sure it is nearly full. Run engine at idle until radiator is at operating temperature. Shake can and pour entire contents into radiator.


  • Stop Rust & Corrosion
  • Lubricates Water Pump
  • Reduces Foaming
  • Compatible with all types of Coolants & Anti Freezes


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