OEMTOOLS 24529 No Gas Loss R134a A/C Valve Core Remover/Installer Replace Leaking Valve Cores Quickly and Easily Built-In Ball Valve Retains Charge and Allows Access to A/C System Remove and Install Valve Cores Without the Loss of Refrigerant For 13 mm and 16 mm High and Low Service Port Applications: Many R134a Automotive A/C Systems with Standard Valve Cores