This toolis a good replacement of the old valve core in the R134A and R12 connector of the car's air conditioner. The broken valve core can be removed through the use of this tool.In the process of removing, the refrigerant in the air conditioner will not leak as the valve lever on this tool is closed, and itis unnecessary to pour the new refrigerant into the air conditioner. Features: 1. Adjustable cool gas quick joint.2. Inclosed low side coupler,the refrigerantwill not leak. 3. The valve core puller is adjustable to fit the R134A / R12 /CR-206valve core.4. Excellent for replacing valve cores withoutreleasing the refrigerant valve core changer. Specifications: Material: Copper + Aluminum Length: Approx. 11.5 cm / 4.53" Valve Core: R134 / R12 /CR-206 Coupler: Low Side (Blue) Package Weight: Approx.150g Quick Joint: Air Conditioning Usage: At this point you should put the gloves and goggles on, and then you can replace the valve core(s) as described below. 1. Unscrew the low-side port's cap 2. Connect the valve removal tool 3. Insert the extractor 4. Unscrew the old valve core 5. Pull the valve core up 6. Remove the valve core 7. The valve core is now out 8. Put the new valve core on the rod 9. Install the new valve core 10. Place the protective cap back on the low-side port Package Included:1 x Blue Valve Core Quick Remover Tool (Low Pressure Side)Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.