This product is a combination of 2 enviro-safe products into 1 for maximum cooling performance. This will remove moisture in the air conditioning system. Moisture can cause corrosion in the a/c system or the a/c to freeze up. Please note, the top of this can has a 134a top which means you need a hose or gauge with the proper ends in order to install this product into your 1234yf vehicle. 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 cannot be added to a fully charged system.Arctic Air for R1234yf systems 6 Cans for R1234yfnbsp; Automotive Air Brass Charging hose Air Conditioningnbsp;