By attaching to the service port by installing the air conditioner it is possible to install it smoothly and comfortably without hurrying the installation of the hose. Even after evacuation, you can relax and surely do without hurrying and without hurrying gas without removing hose. It is very good that work can be done very smoothly and even those who are watching the procedure are given a sense of security. No sound of gas leakage when removing hose using charge valve Looking at the calm work, the feeling that the customer has a good impression with a feeling of security is very good. I appreciate the gratitude of the charge valve.