Description: [Core Tube Structure] Effectively avoid the opening of the core tube while air conditioner driving, accurately control the high pressure and low pressure valve needle of the air conditioner, creating a special thimble for forming fluoride. Effectively prevent leakage. The inflation valve allows you to load and unload the inflation hose while maintaining the vacuum after the vacuum is completed. 【Easy to Operate】The rotary design mounted on the top is easy to use and can be easily switched and operated regardless of the valve position. Simply turn the knob counterclockwise and the internal protrusion will gradually sink and the bug pin tucked into the service port will return to its original state. Even if the inflation hose is removed, air will not enter the air conditioning duct.