Mastercool�s 1/4� FL to R1234yf Conversion Kit is specially designed for vehicles that have minimal access to service ports. These couplers attach to your existing 1/4� hoses and effortlessly snap to R1234yf A/C service ports. All metal construction for extra durability Easily convert any standard 1/4� A/C hose to connect to standard R1234yf service ports