IDEAL-TRIDON 2-Pack 2-5/8-in to 4-1/2-in Dia Stainless steel Adjustable clamp in the Pipe Support & Clamps department at Lowes.com
Cenipar Silver_Vent_Hose_and_STV-90 Dryer Vent Hose-4 inch Ducting Vent Hose(4 inch 10 feet) with 2 Clamps and STV-90 Dryer Duct Connector Dryer Hose Snap fit 4in
4 Pack Ideal Tridon #64 Dryer Vent Hose Clamps 2.5” To 4.5” New | eBay