MR. NOZZLE WET/DRY VAC TANK ADAPTER 1-1/2" HOSE TO 2-1/4" I.D. OPENING - MN05
Amazon.com: ALL PARTS ETC. Vacuum Hose Adaptor 2.5" to 1.25” Compatible with 2.5" Shop Vac Conversion for Fitting 1.25" Attachments, 2 1/2" to 1 1/4" Vacuum Fitting Adapter : Tools & Home Improvement
Amazon.com: WORKSHOP Wet/Dry Vacs Vacuum Adapter WS25011A 2-1/2-Inch To 1-1/4-Inch Universal Shop Vacuum Hose Adapter for Shop Vacuum Accessories : Tools & Home Improvement
Threaded Hose Adapter, 1-1/2'' Hose to 2-1/4'' Vacuum Intake| Rockler Woodworking and Hardware
RIDGID Hose and Accessory Adapter Kit for RIDGID Wet/Dry Shop Vacuums VT1755 - The Home Depot