Features and Benefits: These tools allow the user to service valve cores without losing the systems charge This remover/installer kit makes removal or insertion much easier especially on the larger R-134A valve cores Mastercool s new unique design offers a locking device (patent pending) that holds the shaft in place while removing or installing the valve core Less down time saves money All packaged in a plastic molded box The 58490 Universal R-12/R-I34A Master Kit includes: valve assembly R-134A high side 16mm connector R-134a low side 13mm connector 1/4″ FL swivel connector standard valve core remover/installer assembly GM large bore valve core remover/installer assembly JRA R-134A valve core remover/installer assembly Eaton R-134A low side valve core remover/installer assembly Eaton R-134A high side valve core remover/installer assembly Adapter 1/4″M x 3/16″F high side GM/Ford adapter 1/4″M x 1/8″F high side all packaged in a plastic molded box.