Wynn's Cooling System Stop Leak is a professional formula designed to seal small leaks in vehicle radiators, heater cores, and hoses. This product helps maintain proper coolant levels, preventing overheating and potential engine damage. It is easy to use—simply pour it into the radiator without the need for draining or flushing. The formula is compatible with all coolant types and safe for rubber hoses, metals, and plastic parts. It works effectively in both petrol and diesel engines, making it ideal for a variety of vehicles including cars, vans, and trucks. The stop leak creates durable, flexible seals that resist pressure and temperature changes, providing long-lasting protection. It's a great emergency solution to keep in your trunk for quick leak control.