10" Galvanized Vent Pipe Rain Cap (cone) - Warren Pipe and Supply
1-1/4" Galv Mushroom Vent Cap
Selkirk 4-in x 8-in Galvanized Steel/Aluminum Cap for Natural Gas Venting - UL Listed, 15-Year Warranty in the Galvanized Pipe & Fittings department at Lowes.com
Vent Cap – Cumberland Products
4 Inch Round Roof Rain Cap HVAC Vent Galvanized Steel All Weather Chimney Cap Roof Top Round Roof Vent with Rubber Gasket for Perfect Insulation Vent Cover (4'' Inch) - Amazon.com