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Amazon.com: Dust Collection Fittings Cone Reducer 4" to 2 1/2" in & 4" inch splice/coupler with 4 Vacuum Hose Adapters 2 1/2" in to 1" in plus Shop Vac Adapter 2 1/2"
DCT Dust Collector Accessories Kit – 1.25in x 10ft Vacuum Hose, Dust Collection Fittings, and Vacuum Reducer - Amazon.com
Swivel Reducer Cuff - 2" Vac Hose to 1.5" Tool | Clean Pro Supply