The Tracerline EZ-Ject Injector Kit, No. TP-9841CS, is ideal for all R-134a A/C systems. Using the TP-9831CS adapter allows the kit to work with R-1234yf systems, as well. The kit consists of an EZ-Ject injection tool and multi-dose EZ-Ject disposable cartridge pre-filled with 0.5 oz of universal/ester dye that services up to 14 vehicles. The injector’s hose connects to the low-side service port, and with a simple turn of a handle, adds the exact amount of dye into an A/C system. The dye can be injected whether the system is off or running. Universal/ester A/C dye is co-solvent free and OEM-approved to meet or exceed SAE J2297 standard. It will not impair lubricant properties, which could cause damage to system components.