---Functionality: valve core remover tools Kit can used to quickly remove and install the valve core in AC systems, the refrigerant in the air-conditioning system will not leak, and there is no need to re-vacuum and add the refrigerant to refuel. ---Applicability：This valve core quick remover installer tool kit is adjustable to fit the different valve core. Good for vehicle/car/auto air condition, household air conditioner, HVAC Maintenance or repairing. ---Quality construction: The valve core remover and installer tool kit is made of solid and sturdy metal materials, reliable and durable; The parts are oil-resistant, impact-resistant, corrosion-resistant, water-proof, not easy to chip and break, which support a long time application.