C&D Valve Valve Core Depressor, Large Thumbscrew
These thumbscrew core depressors are designed to be used on the end of a charging hose. When attached to an access fitting they can depress the valve core and control the flow of gas. This also means the core can be shut-off before disconnecting, thus avoiding a split back on your hand. The seals in each part have broad compatibility with the newer refrigerants.