Interdynamics EZ Chill Refrigerant R-134a With Oil And Leak Sealer (12 ounces) 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)