Use the Uniweld A/C Flush Kit to remove contaminates, moisture and acid from the evaporator and condenser. It is designed to work with any A/C flush solvent that can be mixed with pressurized air. Features include a pressure relief valve that opens automatically at 180 to 190 PSI, protecting the cylinder and equipment from overpressure. Also comes with the valve assembly with a liquid dip tube; and Ball Valve with 1/4 turn open/close; 24" flexible service hose; and a blow gun fitted with rubber tip nozzle.