Interdynamics Arctic Freeze Synthetic Automotive Refrigerant R-134a (12 ounces) Replaces lost 134a refrigerant and oil in automotive A/C system System-safe leak sealer additive seals common A/C leaks in rubber hoses, gaskets, and O-rings Formulated with advanced QwikBoost chemistry for colder air up to 50% faster Eliminates moisture buildup and acid from A/C system to extend A/C system life ACME threaded top; Recharging hose sold separately