How many of us have several different tools in our collections, each of which has a fractionally different exhaust diameter? I know I do.
One evening while preparing to connect my shop vacuum to my bench-top sander with duct tape, my eye happened to catch an old bicycle tube hanging in the shop. I felt like Columbus discovering America. I cut a 3" piece of the old tube and slipped it over the exhaust port of the sander, and did the same to the 1" connecter on the vacuum hose for a perfect airtight connection. With the variety of bicycle inner tubes that are available, this would probably work with an infinite number of tools.