Made in USA - 5″ ID, Galvanized Duct End Cap - 03233996 - MSC Industrial Supply
Duct End Cap W50mm D25mm PVC White - MM Electrical Merchandising
18" X 8" Sheet Metal Duct Work End Cap | eBay
GALVANIZED 26 GAUGE ROUND END CAP – A&R Supply - Air Conditioning & Refrigeration Wholesaler
Master Flow 8 in. Round Duct Cap 8DC - The Home Depot
Rolled Lip (Clamped Together Duct) End Cap - Bird Screen | Dust Fume Mist Warehouse
Master Flow 16 in. x 8 in. Rectangular Duct Cap RDC16X8 - The Home Depot
Amazon.com: Vent Systems 4" Metal Tee Cap. Galvanized Steel End Cap. Dryer Vent Cover. Dryer Duct End Cap. 4In Steel End Cap. Steel Plug 4Inch. Round Metal Duct Fitting. Reusable. 100mm :
HVAC OV Galvanized Metal Duct End Cap - 4 Inch Fit with Handle - Available in Different Sizes to Suit - Amazon.com
3" & 4" Ducting End Cap Fan Shroud (80mm,92mm&120mm) – Coolerguys
Various Sized Crimped Steel Ducting End Cap Fittings | Oneida Air Systems
Duct End Cap 'no crimp' (20 Inch) (FC 20) - HVAC Express
IMPERIAL 6-in dia Galvanized Steel Crimped Small End Round End Cap in the Duct Caps department at Lowes.com
End Caps for Vents & Ducts : theductshop.com | HVAC End Caps Ductwork