Heavy Duty Radiator Stop Leak safely and effectively seals internal, external and coolant-to-oil leaks in plastic, aluminum and metal radiators, freeze plugs, gaskets, heads, blocks and heater cores.
- Features Rhizex pellets that dissolve in minutes to seal leaks
- Also conditions the cooling system, inhibiting rust and corrosion, lubricating water pump seals and helping to control electrolysis
- Compatible with all brands of antifreeze
- Suitable for gasoline or diesel engines