AC PRO R-1234yf Advanced Auto Air-Con Recharge Professional Formula Refrigerant + PAG Oil & UV Dye helps replace refrigerant and oil from your A/C system and contains UV dye to assist with detecting and locating leaks in metal and rubber components. STP? R-1234yf Advanced Auto Air-Con Recharge is designed to work with A/C PRO CERTYF102 R-1234yf Gauge and Hose only (NOT included in this kit) STP� R-1234yf Advanced Auto Air-Con Recharge Professional Formula Refrigerant + PAG Oil & UV Dye