Bar's Leaks Radiator Stop Leak 2x Concentrate Sealer is formulated to stop minor cooling system leaks, drips, and seepage caused by normal cooling system wear and age. The stop leak concentrate's formula contains a proprietary blend of matrix polymers and additives designed to seal minor holes and cracks and restore the cooling system to peak efficiency. Packaged in a 6 oz plastic bottle, Bar's Leaks Radiator Stop Leak 2x Concentrate Sealer is a must-have for anyone looking to seal small leaks in their vehicle's cooling system.