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Shop-Vac 2.25" - 1.25" Adapter
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.