125 Viscosity PAG Oil for R134a Systems. Eliminates contaminants from entering the system. Simply inject the amount of oil you want to add from the convenient 8 oz. oil cartridge. An excellent way to top up an A/C system, filling a compressor or accumulator / dryer. From the recognized leader in UV leak detection Uview designs and manufactures and delivers the most innovative and functional products to the automotive repair industry. This convenient 8 oz cartridge utilizes the award-winning spot-gun injection system. Also has the ability to inject a precise amount of oil into a pressurized system via the low side service port. This helps to eliminate moisture contamination. It's simple to use, with its one step process!