This kit includes 1 can of Arctic air for R12, 1 can of Proseal for R12, and 1 can of Oil Charge for R12 with brass charging gauge. This product is a combination of 2 Enviro-Safe products into 1 for maximum cooling performance. This will remove moisture in the A/C system. Moisture can cause corrosion in the A/C system or the A/C to freeze up. The other part of the product will reduce friction in system and provide colder air duct temps in most cases. Compatible with any automotive refrigerant except ammonia and CO2 Drying agent Colder air Longer life A/C Booster DO NOT use in ammonia systems DO NOT use in CO2 systems Gas propelled Installs the same way as refrigerant Cannot be added to a fully charged system