quality material: The R134a to R1234yf adapter is made of brass and undergoes a rigorous testing process. It is designed to resist temperatures and provide robust, durable performance for longterm use without compromising quality. R1234YF low side with quick couplers: This package includes a set of R1234YF quick couplers, featuring a red voltage R1234YF to R134a adapter and a blue low pressure R1234YF quick coupling. Connectors include 1/4' SAE female x pressure, 16 mm R134A quick coupling, and 1/4' SAE female x low pressure 13 mm R134A quick coupling. Adjustable valve: The R1234A adapters are equipped with adjustable valves to enable easy and leak installation and disassembly. This helps prevent leakage in the system and maintains operating performance over time. Easy installation: Rubber seals and deep, precise threads minimize leakage and provide improved sealing. The design makes installation and removal straightforward and convenient for mounting on your vehicle's air conditioning system. Use scenarios: Automotive A/C service on vehicles with mixed refrigerant systems (R134a and R1234YF), enabling safe connection and service. Routine maintenance and pressure checks in shops or mobile service vans, with reliable, leak operation. Onsite diagnostics and recharge tasks that require quick coupling on both and low pressure sides, enhancing workflow and safety.