[PROFESSIONAL ASSISTANT] For removing and installing valve cores in charged systems. Replace leaking valve cores quickly and easily. Double size to work on R410a or R22 charging systems or other replacement replacement systems. [WELL MADE] The valve core remover installation tool is made of brass, which is and not easy to rust, and the metal knobs are of non-slip knurled, which is and you can use them for a long time time. [TIME SAVING] The core grabber tool makes it easy to insert into the inner valve, so you can control the core, no need to stop the machine or release the refrigerant, you can remove and install the valve cores conveniently, save hours of evacuation and charging. Basic Operation of Valve Core Remover Wrench: 1.Pull the dead center on the stem, close the valve on the tool, adjust the joint of the tool to the air conditioning interface and tighten the valve on the air conditioning. />2. Make sure the tool is securely connected to the air conditioning valve, then open