Bar's Leaks 1199 Radiator Stop Leak 11 oz Cooling System Sealer

Bar's Leaks 1199 Radiator Stop Leak is a professional-grade cooling system sealant designed to quickly and permanently seal internal, external, and coolant-to-oil leaks. This 11-ounce bottle features a pre-dissolved tablet formula that makes installation simple and requires no special mechanical expertise.

Advanced Sealing Technology:

• Seals leaks in plastic, aluminum, and metal radiators
• Works on heater cores, engine blocks, cylinder heads, gaskets, and freeze plugs
• Lab-proven to seal larger leaks better than competing products
• Based on OEM technology used on assembly lines for over 75 years

Key Features:

• Pre-dissolved formula for easy, mess-free installation
• Compatible with all antifreeze types and colors including conventional silicate-based and extended life (OAT/HOAT) coolants
• Can be used in straight water cooling systems
• Treats up to 4 gallons of coolant capacity (use 1/2 bottle for 4-cylinder engines)
• Includes water pump lubricant to reduce wear and inhibit rust and scale formation
• Neutralizes pH imbalance and controls electrolysis
• Particles shrink up to 15% to flow through cooling passages without clogging

How It Works:

Once added to the cooling system, the specially formulated particles circulate and flow to leak points. For external leaks, particles collect at the seepage point and build inward to create a permanent seal. The formula begins working within 15-30 minutes of driving or idling the vehicle. The product remains in the system for continued protection and does not require flushing.

Application:

Simply pour into a cool radiator or overflow tank, fill to proper level, and drive or idle for 15-30 minutes. No mechanical knowledge required. Safe for all cooling system components and will not clog heater cores or radiators.