ABRO Heavy Duty Stop Leak Liquid is a fast-acting, permanent solution designed to quickly seal leaks in your vehicle's cooling system. Formulated with powerful water pump lubricants and rust inhibitors, it not only stops leaks but also protects vital components from wear and corrosion. Ideal for use in radiators, water pumps, heater cores, and head gaskets, this versatile formula ensures reliable, long-lasting performance. Safe for use on cracked engine blocks, cylinders, and gaskets, it effectively seals even the toughest leaks.