Appliance Adapter, For Nominal Duct Diameter 4 in, Inlet Diameter 4 1/2 in, Material Steel, Product Type Appliance Adapter, Overall Length 6 in, Maximum Pressure Rating Not Applicable, Maximum Airflow Not Applicable, Inside Diameter 4 in, Outlet Diameter 4 in, Includes Not Applicable, End Type Snap Lock, Gas Appliance Category Category I