Features and Benefits: * One step, just pour and go * Seals head gasket leaks, radiators, engine blocks, water pumps, etc. * A repair made with K-Seal HD is permanent, guaranteed for the lifetime of the engine * Unlike inferior coolant products, K-Seal HD mixes with all types of antifreeze and coolant, there’s no need to drain or flush the system before or after treatment Pour into radiator and let engine run for a few minutes.