Confused about Vacuum Hose Sizes

Created and shared this adapter mount after printing Doug’s 2-1/2" vac hose mount only to realize that OD for 2-1/2" Vac hoses significantly varies…

Currently using this configurable parametric OpenScad based adapter which snuggly pushes into Doug’s 2-1/2" vac mount. Snug enough to not even need layer(s) of tape to make acceptably air tight. Held by friction and obstructions that kinda lock the adapter in place. Didn’t bother threading. Seems good enough, that most suction losses are happening elsewhere.

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