High pressure quick connector set for automotive air conditioning service. The instant locking and releasing mechanism allows tool free connection and disconnection of refrigerant pipelines, improving maintenance efficiency. Key specifications - High pressure (red): Head R134A 16 mm; middle 1/4 SAE internal thread and 1/4 SAE external thread; bottom R1234YF 17 mm - Low pressure (blue): Head R134A 13 mm; middle 1/4 SAE internal thread and 1/4 SAE external thread; bottom R1234YF 14 mm Installation location - High pressure quick connector is typically installed on the high pressure line near the compressor output, where refrigerant pressure rises after the compressor and enters the condenser Product usage - Enables quick and safe connection or disconnection of air conditioning system pipelines without tools for refrigerant charging, discharging, or recovery work Scope of use - Suitable for AC charging of R1234YF/R12 to R134A automotive air conditioning - Compatible with R1234YF refrigerant, AC manifold pressure gauge - Useful for diagnostic inspection, recovery and evacuation work Product features - Instant locking and releasing mechanism for fast, tool free connections and disconnections Product composition - High voltage connector: 1 piece - Low voltage connector: 1 piece - Air conditioning valve core wrench: 1 piece