Wall Cap For Nominal Duct Diameter 3 in 4 in Gas Appliance Category Not Applicable For Duct Height Not Applicable For Duct Width Not Applicable Inlet Diameter Not Applicable Material Aluminum Overall Length 5 3/4 in Product Type Wall Cap Inside Diameter Not Applicable Material Thickness 25 ga Weight 0.31 lb Maximum Pressure Rating Not Applicable Maximum Temperature Rating Not Applicable Seal Material Not Applicable Standards Not Applicable Finish Milled Color Silver