IMPERIAL 6-in dia Galvanized Steel Crimped Small End Round End Cap in the Duct Caps department at Lowes.com
4" Galv Mushroom Vent Cap
Mushroom Vent Cap – Trupply LLC
60 mm ~ 300 mm stainless steel exhaust hood, Wall wall vent cap,Air Vent Bull Nose Bathroom Extractor Outlet Grille Louvres
641 | Aluminum Wall Cap, 6-Inch Round Duct
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