Bar's Leaks Cooling System Radiator Stop Leak seals internal, external and coolant-to-oil leaks. Works safely and effectively on plastic, aluminum and metal radiators, heater cores, blocks, heads, gaskets and freeze plugs. Compatible with both conventional silicate-based and extended life (OAT/HOAT) antifreeze, all types and colors. Can also be used in straight water.

Product Features:

• Protects the Entire Cooling System
• Stops Current and Future Leaks
• Lubricates Water Pump Seal
• Pre-dissolved Rhizex Pellets for Easier Application