Shop Vac Accessory Adapter

I have a Shop Vac with a 29mm OD hose that I use for everything around the house but it's not great for carpets. My actual carpet vacuum has a great carpet adapter to clean things like car seats and couch but it doesn't fit on the Shop Vac having an OD of 19.5 mm. I designed this adapter to allow the accessory to be used with the Shop Vac. Anything else with the same outside diameter will work as well.

The tolerances are tight enough that everything stays together while not being too tight to attach. Edges are rounded to more easily assemble.