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

POWERTEC 4 to 2-1/2 Inch Hose Reducer Adapter (70104)

Versatile 4-Inch to 2-1/2-Inch Dust Hose Reducer for Seamless Compatibility

Vacuum Adaptor Adapter Dust Port Power Tool Sander Reducer Extractor Hose Pipe

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

POWERTEC Dust collection Reducer, 2-1/2-Inch to 2-1/4-Inch (70141)

Dryer Vent Cleaner Lint Remover Vacuum Hose Attachment for Dust and Pet hair

Dryer Vent Lint Power Remover Vacuum Hose Attachment Cleaner Kit for Washer Duct