 K-Seal fights the most difficult coolant leaks, including head gaskets and engine blocks. Now there's K-Seal Ultimate, featuring 33% more sealing power than original K-Seal. K-Seal's unique formula works with all water-cooled engine castings, including aluminum. No need to drain or flush your cooling system. Just shake the bottle and pour K-Seal Ultimate into the cooling system, and you're back on the road. K-Seal Ultimate is now available at Walmart. Learn more at kseal.com. Don't just seal it, K-Seal it.