Vacuum Adapter
thingiverse
Update: I recommend version 2 at https://www.thingiverse.com/thing:3713421 Simple, customizable vacuum adapter. Specify the diameter for both adapter ends, choose between male or female end type, decide on taper amount, and set wall thickness. Bug fix implemented. A subtle taper is now added to each end, allowing a snug fit when pressed together. Taper amount adjustment is now available for both ends.
Download Model from thingiverse
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