POWERTEC 4 in. x 2-1/2 in. Cone Reducer for Dust Collection Systems 70136 - The Home Depot
1 7/8 Vacuum Hose Adapter to Dewalt Table Saw 2 1/4 Inch Dust Port - Etsy
4-Inch X 20-Foot Universal Dust Extractor Hose Home Accessories Parts - AliExpress
Amazon.com: POWERTEC 70143 4" x 20' PVC Dust Collection Hose for Dust Collector for Woodworking and Shop Vacuum, 4 Inch Dust Collector Hose for Dust Collection Fittings, Clear : Tools & Home Improvement
POWERTEC 70150 Rectangular Dust Hood Collector – ABS Plastic, 4 Inch OD Attachment for Woodworking Dust Collection Hose and Fittings - Amazon.com
4" Elbow for Dust Collection Systems - Lee Valley Tools
WEN DCA001 4-Inch to 2-1/2-Inch Cone Reducer Attachment for Dust Hoses — WEN Products
Amazon.com: 4 Inch OD Self Cleaning No Clog Aluminum Blast Gate Cut Off Valve for Dust Collection System ABG4 : Tools & Home Improvement