The Bar’s Leaks Jack Oil with Stop Leak, No. HJ12, is designed to stop seal and O-ring leaks in jacks and other hydraulic shop equipment caused by normal wear and age. The product also works to stop leaks in other hydraulic shop equipment, including transmission jacks and engine lifts, as well as snow plows. According to the company, it is non-corrosive, non-clogging and non-foaming. Available in case packs of six 12 oz. bottles, it is made in the U.S.A.