The TP-9772 BigEZ Hybrid/Ester Oil Injection Kit makes adding lubricating oil to a hybrid A/C system a time-saving, uncomplicated process. At the heart of the kit is the BigEZ injector assembly. It’s just one connection — simply turn the handle to inject the dye. Also included is a solid-brass R-134a hybrid coupler with a check valve and purge fitting. Unlike a hose, the all-metal coupler is non-permeable and allows easy connection to the low-side service port. Rounding out this injection kit is a 4 oz (118 ml) hybrid/ester oil cartridge filled with unique lubricating oil that is specially formulated for use in all hybrid vehicles.