PRO-TEC Radiator Stop Leak reliable seals leaky water coolers and heat exchangers, leaking water pumps and valves, loose connections and cracked coolant hoses without clogging the system. The use of PRO-TEC Radiator Stop Leak increase the reliability and lifetime of the engine. Finally, the environmental impact is reduced through dense cooler. PRO-TEC Radiator Stop Leak is also ideally suitable for preventive applications.