Interdynamics EZ Chill Automotive Refrigerant R-134a (18 ounces), MAC-134RFL Automotive refrigerant R134a refill Restores lost refrigerant and oil in automotive air conditioning systems Contains system safe leak sealer additive that seals common A/C leaks in rubber hoses, gaskets and O-rings Professional grade Requires the use of the EZ-Chill hose and gauge assembly (sold separately)