Complete with 20 brass valves cores, 270 sealing washers, and multiple adapters, this 309 piece set provide comprehensive solution for refrigerants port configurations and maintenance needs Designed for HVAC technicians and refrigeration specialists, this professional cores grabbers tool simplifies maintenance tasks across residential and commercial units Angled small ball valves design with resistant seals ensures leak proof operate, while erosion resistant brass construction secure long term durability in demanding environments optimizes for split systems repairs and commercial refrigeration setups, its small size allows easy access to valves ports in confined spaces during emergencies maintenance The HVAC valves cores remover tool efficiently replaces R410A / R22 valves cores without refrigerants release, featuring double 1 / 4 " and 5 / 16 " brass adapters for general compatibility with HVAC systems, Manufacturer: JDNH