Amazon.com: Shop Vac Hose Adapter Fitting. 2 1/2" Universal Shop Vacuum Attachments Kit. Shop Vac Hose Reducer For 1.25" to 1.35" (31.75-34.5mm) Hoses and Shop Vac Accessories. Shop Vacuum Hose Replacement Part :
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Amazon.com: Dust Collection System Adapters Shop Vac Attachments 4 inch to 2.5 inch Reducer 2-1/2-Inch to 1-1/2-Inch Fitting 1.25 to 2.5 inch Coupler Dust Collector Fittings Accessories : Tools & Home Improvement