Tracer Products’ Tracerline TP-3812 Hybrid Vehicle A/C Dye Injection Kit features a new dye specially formulated for use in all hybrid vehicles. At the heart of the kit are three Tracer-Stick capsules filled with a concentrated, co-solvent-free POE fluorescent dye with a unique additive package blended exclusively for hybrid A/C systems. The kit also includes an R-134a hose/coupler with check valve, a purge capsule, and two purge/service fittings for both hose purging and connecting to a refrigerant source. The dye and refrigerant are injected together, yet no residual dye is left in the hose to absorb moisture. Wherever the refrigerant escapes, so does the dye.