4 N 1 Charging Hose Gasket Installer - Used for installing 1/4" and 3/8" hose gaskets on charging hoses. Includes gasket installer tool, stainless steel valve core removal wrench/tool, 12 - 1/4" and 4 - 3/8" hose gaskets. Unscrew body of tool to store hose gaskets and valve cores. Made by EB Tools.

http://www.valvecoretool.com/