Bar's Leaks Liquid Radiator Stop Leak provides a permanent seal for leaks in plastic, aluminum and metal radiators, heater cores, blocks, heads, gaskets and freeze plugs.

• Predissolved liquid formula has millions of tiny particles to permanently seal leaks in plastic, aluminum and metal radiators, heater cores, blocks, heads, gaskets and freeze plugs
• Compatible with virtually all brands of antifreeze, including conventional silicate-based green and blue and extended-life red/orange and yellow (OAT/HOAT) coolant
• Inhibits rust and corrosion while helping to control electrolysis
• 1 bottle treats 6-, 8-, and 10-cylinder engines and hard-to-stop leaks in 4-cylinder engines