Tracer Products' BigEZ Hybrid/Ester Oil Injection Kit, No. TP-9772, 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, an easy and accurate way to add oil to hybrid A/C systems. 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. Includes a 4 oz (118 ml) hybrid/ester oil cartridge filled with a unique lubricating oil that is specially formulated for use in all hybrid vehicles.