Technicians can inject 1/4oz. of Fluoro-Lite fluorescent leak detection dye into air-conditioning units with the squeeze of a trigger. The Tracerline EZ-Shot multi-dose A/C dye injection gun uses a BigEZ disposable dye cartridge that is prefilled with 8oz. of universal Fluoro-Lite dye, enough to service 64 vehciles! The injector connects easily to the low-side A/C service port; it's exceptionally efficient and economical.