The Shotgun Dye Injection Kit, No. 6891, from FJC, uses the world's most popular and professional injection method, making it so that users only have to pull the trigger to inject a precise amount of dye into the A/C system. The kit includes an injector with R-12, 134a, and R-1234yf adapters, as well as a 5.6-oz A/C UV dye cartridge and service stickers.