This is a New Carrier, Bryant or Payne Complete High efficiancy heat exchanger kit, for Many different 80,000 BTU high efficiancy furnaces. It includes One-334357-755 Secondary Condensing Heat Exchanger, Four-320723-751 Primary Heat Exchanger Cells, One-320720-760 or 320720-761 Cell Inlet Panel, One-330539-753 Coupling Box kit, One-330541-753 Cell Outlet Panel. Please, before purchasing send us the ” PRODUCT NUMBER ” from the tag on your furnace and we will confirm that all these parts will fit your furnace. If you need this, you may need it fast.