Bar's Leaks Power Steering Stop Leak Concentrate is specially designed to stop seal and O-ring leaks caused by normal power steering wear and age. Works on rack & pinion units, gear boxes and pumps. Keeps power steering seals soft and pliable. Non-corrosive, non-clogging and non-foaming. Works with ALL domestic, import and heavy duty power steering fluids; including petroleum, mineral oil, synthetics and ATF automatic transmission fluid.