Avalanche, 12 oz., Premium R-134a A/C Recharge Kit with smart clips. Easy to use vent clips change to blue and green toshow correct refrigerant charge and to prevent overcharging. No gauge required. 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. System safe chemical additive stops leaks in o-rings and other rubber components where most common leaksbegin. Push-button disposable recharge hose. Not for use on hybrid/electric vehicles with non-belt driven (electric driven) compressor.