Semetall 2.5 Inch Metal Tee Cap - Round Dryer Vent Cover - Metal Duct Fitting...

Semetall 3 Inch Metal Tee Cap - Round Dryer Vent Cover - Metal Duct Fitting-R...

White Square Extractor Louvre Air Vent Duct Grille 100mm, 4 Inch Wall Fan Outlet

Steel Roof Vent Cap 3in 4in Round Duct Bathroom Exhaust Fan Black

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Broan-Nutone 636 Steel Roof Vent Cap for 3" and 4" round Duct, for Bathroom