Bar’s Leaks® Original 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. Pre-dissolved for easy installation. Also lubricates water pump seal to protect against potential future problems.
