This R1234yf to R134a AC adapter kit is a practical solution for vehicle air conditioning service. It includes the key fittings needed for refrigerant charging, evacuation, recovery, and pressure testing. The red quick coupler fits 16mm high-side ports, while the blue quick coupler fits 13mm low-side ports. The self-sealing can tap works with standard R1234yf refrigerant cans, and the included adapter helps connect with 1/4" SAE hoses and R134a service tools. Built from solid brass for durability, tight sealing, and repeated use during A/C maintenance.