The Tracer Products TPOPUV19 UV Leak Detection Kit is suitable for R-1234yf/PAG air conditioning systems. Each kit includes three Mini-EZ dye cartridges, an EZ-Ject dye injector assembly, a R-1234yf hose/coupler and purge fitting and a two ounce bottle of GLO-AWAY Plus florescent dye cleaner. The kit also includes the TPOPUV Opti-pro UV corldess, violet light leak detection flashlight. Each Mini-EZ cartridge is filled with Fluro-Lite 5 dye formula, an improved fluorescent dye formula that is up to 10 percent brighter than previous formulas, the company says, and offers a shelf life of up to five years.