Premium, 18 oz. R-134a A/C Recharge Kit with SMART CLIPS, CA. Smart Clip Technology - Easy to use vent clips change to blue and green to show correct refrigerant charge and to prevent overcharging. No gauge required. AVALANCHE Proprietary refrigerant formula replaces lost refrigerant and oil. The formula improves the a/c's cooling capabilities and provides better heat exchange by forming a protective film to decrease friction, reduce engine drag, prevent oxidation and sludge formation and extend the compressor life. Stop Leaks - System safe chemical additive stops leaks in o-rings and other rubber components where most common leaks begin. Push-Button disposable recharge hose. Not for use on hybrid/electric vehicles with non-belt driven (electric driven) compressor.