The Shotgun Dye Injection Kit, No. 6891, from FJC, is designed for fast, precise, and mess-free introduction of UV dye into both R-134a and R-1234yf A/C systems. Built with durable metal construction, it is engineered for repeated professional use in demanding shop environments. The included hose and coupler provide quick, secure connections for efficient service work, while compatibility with FJC Universal A/C UV dyes ensures seamless integration into existing diagnostic workflows. Ideal for accurate leak detection, this tool helps technicians identify issues faster, reduce downtime, and improve overall service efficiency in modern automotive A/C systems.