Features & Benefits: Includes one 8 oz. cartridge of ExtenDye UV dye; Includes 1234YF refill hose and adapter; Fast, easy injection system with no contamination, precise injection with no waste; ExtenDye is formulated with super concentrated UV dye, plus friction modifiers , and wear additives and antioxidants; Be ready for the new R-1234YF systems with our specially formulated UV dye kit with ExtenDye. The perfect kit for multi-use applications using the world's most popular AC injection system.