Johnsens 4918 Radiator Stop Leak 12 oz Bottle

Johnsens 4918 Radiator Stop Leak is a professional-grade cooling system sealant designed to quickly repair minor leaks in radiators, heater cores, gaskets, and freeze plugs. This 12-ounce bottle contains a fast-acting formula that circulates through the cooling system to seal leaks from the inside out without clogging the system.

Key Features:

• Seals minor leaks in radiators, heater cores, gaskets, and freeze plugs
• Safe for all cooling system metals including aluminum
• Non-clogging formula will not harm water pumps or thermostats
• Compatible with all types of antifreeze and coolant
• Easy pour 12-ounce bottle treats most passenger vehicles
• Begins working immediately upon circulation

This stop leak formula is ideal for emergency repairs and preventative maintenance. Simply add to the radiator or coolant reservoir while the engine is cool, then run the engine to allow the product to circulate and seal leaks. Johnsens has been a trusted name in automotive chemicals and fluids for professional mechanics and DIY enthusiasts alike.