Bar's Leaks Original Radiator Stop Leak seals internal, external, and coolant-to-oil leaks without draining the system. The pre-dissolved formula requires no automotive expertise - pour into the radiator or overflow tank and drive for 15 to 30 minutes. Compatible with all antifreeze types and colors, including conventional silicate-based and extended life OAT/HOAT formulas.

• Seals leaks in radiators, heater cores, blocks, heads, gaskets, and freeze plugs
• Works on plastic, aluminum, and metal radiators
• Compatible with conventional and extended life OAT/HOAT antifreeze
• Pre-dissolved for easy, no-mess installation
• Lubricates water pump seal for added protection
• Helps control electrolysis and inhibits rust and scale
• One 11 oz bottle treats cooling systems up to 4 gallons
• Part No. 1199