This tool is a R134A joint disassembly tool for car air conditioners. If there is a valve core leak, you can use this tool to replace the new valve core. The refrigerant in the air conditioning system not leak, and there is no need to re-vacuum and add refrigerant before refueling. Because you must re-vacuum and add refrigerant after replacing the valve core, this tool can that the refrigerant in the system not leak. Do not vacuum it again. [Product Name]: R134a Valve Core Disassembly Tool (No Refrigerant) [Product Function]: Replace the valve core without releasing the refrigerant []: If the valve core of the car air conditioner leaks, you can use this tool to replace the new valve core. The refrigerant in the air conditioning system not leak, and there is no need to re-vacuum and add refrigerant before refueling. Because you must re-vacuum and add refrigerant after replacing the valve core, this tool can that the refrigerant in the system not leak. Do not vacuum it again. The Compatibility Is Just For Please Compare The Part Number With Your One Before Purchasing! Note:Different batches of gasket plastic box colors are random, don't accept the specified color, there are slight differences between the actual product and the picture, which does not affect normal use Colour:Photo Color Material:copper Package Contents: 1 x R134A R1234YF Valve Core Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.