Features NON SLIP: The knurled knob ensures a comfortable feel, and the metal nut is non slip and durable, which has a stable and reliable connection. BRASS MATERIAL: The liquid safety valve is made of thickened brass, with high pressure resistance and can withstand the pressure of refrigerant. STANDARD THREAD: This refrigerant charging valve has standard imperial thread, 1/4in male 5/16in female thread for a tight connection without slipping. EASY OPERATION: With knob linkage, and wire shaft synchronization, can be automatically tightened just by rotating the knob at the end, without leakage. WIDE APPLICATION: This refrigerant charging safety valve is suitable for R22, R410, R134A, R404 refrigerants, which has a wide range of applications. Specification: Item Type: Refrigerant Valve Material: Brass Sealing Method: 4 layers sealing Applicable Refrigerant: R22, R410, R134A, R404 Refrigerant Interface: Imperial Thread (1/4in Male 5/16in Female) Package List: 1 x Refrigerant Valve Note: Match the appropriate model size before installation and use Package List 1 x Refrigerant Valve