Dufrost Duct Set for 1957 Chevrolet Car. Attach to factory location with Clip and Screw included. Will work with our Old Air Products CAP-7000 and CAP-7100 Series Hurricane A/C Heat and Defrost System. Will also work with most after market A/C and/or Heater systems using 2' defrost duct hose. Note: Not intened for use with Factory A/C or Heater ...