Remove and install valve core in the system,R410A R22 systems included Replace Leaking valve cores quickly and easily Work on service Schrader valve cores of booth 1/4 inch and 5/16 inch service ports , solid brass tool has a ball valve that can be opened or closed in just a quart-turn Solid Brass/Steel construction designed solid and to last Features: Suitable for the crowd: or professionals and do-it-your-self handy men alikeAbout this item Work with: easy connect with 1/4 or 5/16 R22 or R410a systems yes, dual size Great function: The valve core remover installer tool is made of pure copper; The metal knob is all designed with anti-slip design; The schrader's core grabber tool be easily inserted into the inner valve core to control the core. No need to stop the machine, no need to release the refrigerant, the dual size 1/4&5/16 can adapt to R22/R134/R410/R32 Rair-condition, external bypass port design can remover valve cores. Ball value handle, metal schrader cap, schrader's core