Valve Core Remover Installer Material: Copper Service ports: 1/4" and 5/16"SAE Female Bypass ports: 1/4" SAE Male For removing and installing valve cores in charged systems. Replace Leaking valve cores quickly and easily. Dual size to work on charge systems of R410a or R22 or other retrofit replacements systems. Valve Core Removal Wrench Basic Operation: Pull out the dead point 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. Make sure that the tool is connected tightly to the air conditioning valve, then open the valve on the tool. Push the stem into the air conditioning valve and gently rotate the tail knob of the remover. Find the angle to connect the valve core, and then loosen it. When the valve core is removed, pull out the stem, close the valve on the valve remover, loosen the screw at the end of the tool and take out the valve core. The work is done! Note: We suggest that before removing the valve core, close the valve core wrench valve and disconnect the air conditioner internal connection.