GREAT FUNCTION -- The valve core remover installer tool is made of solid brass. The metal knob is all designed with anti- design; The core tool be inserted into the inner valve core to control the core. No need to stop the machine, no need to release the refrigerant. APPLICATION -- Work with , , Dill valve core remover installer changer R22, R410a refrigeration air condition .The dual size 1/4&5/16 can adapt to R22/R134/R410/R32R air-condition. -- High strength and hardness. Designed with a stainless steel ball and brazed side fitting for durability and . Remove valve cores quickly and . GOOD DESIGN -- Durable, solid brass tool has a ball valve that can be opened and closed in just a quarter-turn, rather than a slower to operate stem-type valve. (No Loss) EASY TO USE -- The core tool be inserted into the inner valve core to control the core. the valve and disconnect the air conditioner removing the valve core. How to Remove Valve Core: Connect and lock the valve core installer to your home A/C valve core screw port. whether to 1/2 inch pure brass adapter according to the actual situation. Turn Disconnect valve to vertical position, insert Valve core remover rod, slowly rotate to find and insert your home A/C valve core. Rotate Valve core remover rod counterclockwise. After hearing the sound of "Puff...", rotate counterclockwise 3-5 turns to remove your valve core, and then pull out Valve core remover rod . Turn Disconnect valve to horizontal position, unscrew Extremity port unscrew , take out Valve core remover rod , remove your broken/ A/C valve core. Specifications: Colour:yellow Material:brass Package Contents: 1 x 1/4 inch and 5/16 inchValve Core Remover 4 x Valve cores Note: removing the valve core, the valve core wrench valve and disconnect the air conditioner internal connection. , keep from children. Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.