Threaded Hose Adapter, 1-1/2'' Hose to 2-1/4'' Vacuum Intake by Rockler

The narrower end threads onto the coiled hose, while the wider end fits into the vacuum. Made from a durable polymer.

Dust Collection Hose, Dust Collection

POWERTEC 4 in. Stainless Steel Key Hose Clamp, Thumb Screw Dust Collector Hose Clamps (5-Pack) 70120 - The Home Depot

Threaded Hose Adapter, 1-1/2'' Hose to 2-1/4'' Vacuum Intake, Rockler Woodworking and Hardware

The 4 to 2-1/2 Cone Reducer by POWERTEC This limited adapter was designed to provide you with a simple solution to coupling your 4-inch ID dust hoses with 2-1/2 ID dust hoses. Specifically, it allows you to step down from a larger main line to a smaller branch line without compromising air velocity or the effectiveness of your dust collection system.

POWERTEC 70136 4-Inch to 2-1/2 inch Cone Reducer

Rockler Dust Port Adapter, 1-1/4 Vacuum Wand to 2-1/4 Port

One end of the adapter features a 4 rubber boot and a hose clamp for securing it tightly over a 4 power tool dust port. The 2-1/4 I.D.

Rockler Dust Right Dust Right 4 to 2-1/4 Shop Vacuum Tool Port Adapter

2-1/2'' Shop Vacuum Hose Adapter Rockler Woodworking and Hardware

This versatile fitting slides into standard 1-1/4 openings found on many bench top style tools and accessories allowing you to adapt them to standard 2-1/2 dust systems. Works great with the Kreg Jig K4 Pocket Hole System (#27204, sold separately), Kreg Jig K4 Master System (#41410, sold separately), Kreg Jig K5 Pocket Hole System (#49989, sold separately), and the Dust Right Separator (#45556, sold separately).

2-1/2 in to 1-1/4 in Adapter

Rockler 2-1/2'' Swiveling Hose Adapter for Shop Vacuums

WoodRiver Dust Connection - 1-1/2 to 2-1/4 Adapter Dust Collection Fitting

How to easily make Wet Dry Vac Hose to PVC pipe adaptors