Radiator Stop Leak 150 ml

Radiator Stop Leak 150 ml

Regular price $0.00 $11.51 Sale

Radiator Stop Leak
SKU: 20132
Will immediately seal small leaks caused by external damage, porous solder joints and hairline cracks in cooling systems of all water cooled engines. Coolant is prevented from entering the combustion chamber due to internal leaks from head gasket etc. It does not react with oxygen or heat and will never prevent system flow or cause overheating. Radiator Stop Leak works as long as it’s in the coolant.
For any water based cooling system with or without filters (exception: "Low Conductivity"-coolants). Safe to use with aluminum and plastic radiators. Contents (250 ml) is sufficient for 10 Liters (2.6 gal.) coolant. Compatible with most types of coolant or anti-freeze. May be used as a preventive.


  • permanently and reliably seals hairline cracks and small leaks
  • suitable for aluminum radiators
  • for preventive use
  • no negative side effects on the water pump or heating circuit
  • compatible with conventional coolants and antifreezes


Shake well before use. Add contents to the cold cooling system. Start up the heater. Then drive the vehicle for at least 10 minutes. Contents (250 ml) is sufficient for 10 Liters (2.6 gal.) coolant.