What is a valve core?
If you look straight down into the top of the valve stem you will see the very top of the core threaded inside the valve stem. The valve core remover tool that comes with the sealant slips right over this and by turning the tool in a counter-clockwise direction you will begin to unscrew the core. Keep turning until the entire piece falls out of the stem. With the core removed, SLiME can now be easily installed through the cleared passage. When the installation is complete, clean the area and replace the core screwing it tightly into place.
