HVAC OV 5\" to 4\" Inch Round Duct Reducer - Male Fit Galvanized Steel Pipe Increaser - Coupling for Round Duct Ventilation Systems - Heating & Cooling, HVAC

4 Inch Galvanized Steel Rain Cap - Round Roof Chimney Cap - Vent Roof Cover - Rubber Gasket for Best Fit - Moisture and Hot Air Exhaust - Metal Flue Cap

HVAC OV Galvanized Metal Duct Connector - 10 Inch Fit - Round Ventilation Pipe Coupling and Extension - Available in Different Sizes to Suit