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3M™ Vacuum Hose Fitting Adapter 28304, 1 in External Hose Thread x 1 in Friction Fitting Barb
2 to 2.25 inch Plastic Vacuum Hose Connection Adapter | Oneida Air Systems
Amazon.com: Vacuum Cleaner Adapter 35mm (1-3/8 Inch) to 31 mm (1-1/4 Inch) for Inner Diameter 32 mm Brush Fit to Outer Diameter 35 mm Tube Plastic Vacuum Hose Adapter(2 Pieces): Home & Kitchen
2.5 to 1.25 and 1.5 inch Vacuum Hose Adapter Kit | Oneida Air Systems
RIDGID Hose and Accessory Adapter Kit for RIDGID Wet/Dry Shop Vacuums VT1755 - The Home Depot
Amazon.com: Universal Vacuum Hose Adapter Kit Reducer Attachment Set Converter from 1 1/2 inch to 1 1/4 inch from 1 3/8 inch to 1 1/4 inch Dust Hose Port Adapter : Home & Kitchen