Robinairs No. 16355 UV Dye Injection System is exactly what you need to find automotive air conditioning leaks quickly and easily. The included high performance uUltraviolet dye is injected and circulated throughout the entire A/C system then seeps out with the refrigerant at the point of a leak where it can be detected. Simple to use - just twist cartridges onto the injector gun, hook up to the service port, and pull the trigger to inject the dye into the A/C system. Kit includes: Injection gun, R-134a hose, R-12 adapter, and four universal twist-on A/C dye cartridges - enough dye for 20 applications. Does not include UV lamp. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets.