The Bar's Leaks Power Steering Stop Leak Concentrate, No.1630, is designed to stop leaks in seals and O-rings caused by normal power steering system wear and age. The non-corrosive, non-clogging, and non-foaming formula works on rack and pinion units, gear boxes, and pumps. It keeps power steering seals soft and pliable. It also works with all domestic, import, and heavy duty power steering fluids, including petroleum, mineral oil, synthetics, and ATF automatic transmission fluid. One bottle treats up to 3 qt. of fluid.