This Mastercool MSC83736-K (MAS83736K) Deluxe R1234A to 1234yf Conversion Kit is a great way to convert your R1234A refrigerant to R1234YF refrigerant. This kit includes everything you need to convert your R1234A refrigerant to R1234YF refrigerant, including a conversion kit, conversion instructions, and a conversion kit safety guide.