Review on 🚗 Certified AC Pro R134A Car Air Conditioner Refrigerant Recharge Kit with Hose, DVA-1 by John Kennedy

But other than that they look ok. The center of the cap has a spring-loaded center section that moves the center pin down into the refrigerant tank when the top valve or hose assembly is installed, opening the tank valve. The upper male part is plastic and smooth, the inner female part is brass. I suspect that the male top will not stand up to many uses. It's too easy to mistake the thread from the outside.