This is an adapter patterned after the hose end for a Shop-Vac BucketMax. It allows the use of 1 1/4" hose ends in vacuums with a 2 1/4" port. I did briefly check one of my bigger shop vacs and it fit that as well.
I have included the .stl file, as well as the .skp file at 10x scale.
John Tatum is a software developer living in central Texas. He likes clean code, scalable infrastructure, and automation. When he is not at work, John enjoys whatever seems interesting at the time.