XTreme Tape - Duct Wrap for Dust Collection Fittings & Hoses - 1-1/2 W x 25' L
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
DCT Dust Collector Accessories Kit – 1.25in x 10ft Vacuum Hose, Dust Collection Fittings, and Vacuum Reducer : Amazon.ca: Tools & Home Improvement
Shopsmith Dust Collection Accessories - Fittings and Bags
Delta 4 in. Plastic Splice Dust Collector Accessory 50-457 - The Home Depot