Check the listing for details. Enviro-Safe Stop Leak for 1234yf, 3 oz. & Hose, Stops Leaks in Hoses & Seals. Condition: New. Listed at 22.50 USD. For 1234YF automotive useWith age, o rings and seals will shrink and deteriorate.When Enviro-Safe Stop Leak is added to your a/c system, it reconditions the rubber o rings and seals.When the Stop Leak product is installed in an air conditioning system, the product mixes with the refrigerant and oil. As the product circulates in the system, it comes in contact with the o’rings and seals causing them to swell, resulting in "no leak".Stop Leak will not repair or "fix" cuts or worn out o’rings or seals.1 can will treat 1 vehicle.Installing Enviro-Safe Stop Leak may stop the yearly recharge of lost refrigerant.Use only with Mineral, Ester, and Pag oils.DO NOT use in ammonia systemsDO NOT use in CO2 systemsCannot be sent to Alaska or Hawaii or exported to foreign countries except in pallet quantitiesGas propelledInstalls the same way as refrigerantCannot be added to a fully charged system