Review on Universal Black A/C Valve Core Remover/Installer by MASTERCOOL - Model 58490 by Ryo Flora

This is a well made Mastercool tool. I used this tool to remove and replace the Schrader valve core on a Ford Fusion. The system was pressurized and core replacement was performed on the high voltage side of the AC system. I watched an online video showing how to use the tool before attempting to fix it. The tool worked great and replaced the core without losing the 134a refrigerant. Basically, the tool paid for itself the first time I used it and saved me the hassle of vacuuming and charging the air conditioner. In my opinion, the tool is worth the money and has simplified the work as much as possible. This is a high quality tool.