70104 4 Inch to 2-1/2 Inch Hose Reducer, Dust Collection Fittings for Dryer V...

Powertec 70136 4" to 2-1/2" Cone Reducer for Versatile Dust Collection

70104 4 Inch to 2-1/2 Inch Hose Reducer, Dust Collection Fittings for Dryer V...

POWERTEC 70141-P2V Dust Collector Reducer 2-1/2-Inch to 2-1/4Inch Reducer 2 Pack

70140 2-1/2” to 1-1/4” Hose Reducer – Conversion Unit for Dust Collection Acc...

Compact ABS Cone Reducer: Effortless Connection for 4-Inch and 2-1/2-Inch Hoses

Dust extractor hose connector reducer 3D Printed-Custom

Shop Vac Hose Adapter 2.5” to 1.25” Reducer for Craftsman / Ridgid – Black PETG