Seals radiators, heater cores, gaskets and hose connections in cars, trucks and tractors fast! Specially formulated to be effective in all cooling systems.
Leaks in cooling systems are often a result of coolant neglect. Heavy Duty Stop Leak is formulated with organic fibers to work on cooling systems found in cars, trucks and tractors. Its blend of dry sealing particles quickly seals leaks from openings as large as 0.012” X 0.5”.