Duo Dolly is just that. Now you can use the Duo Dolly to attach any thread based trash can or any manufactures’ wringer bucket combo. This dual function dolly is designed for the Delamo Auto System (Auto Dolly and Janitor Auto Carts). Dozens of combinations for every task — use a regular and recycled waste can for one person trash collection, or a full size waste can and Janitor cart, or other existing tools and more. Made in USA.