Chimney Hole Cover Stove Pipe Cover Corrosion-resistant Stove Pipes For Ventilation Outlet Roof Chimney Cap - AliExpress
Amazon.com: DuraVent DVL 6DVL-X8 Double Wall Interior Stove Pipe Increaser to Vent Smoke & Exhaust, 6 Inch Diameter to 8 Inch Diameter Connection, Black : Home & Kitchen
Wood stove Interior Cleanout Cap missing? : r/woodstoving