2" PVC coupler
thingiverse
Fits snugly but isn't airtight unless you include a filament-compatible sealant. This design can also be used as an extension to table legs from the project available at this link: http://www.thingiverse.com/thing:1111686 If this concept is helpful to you, please share your own work and be sure to browse through my many diverse submissions found here: http://www.thingiverse.com/3E8/designs Happy creating!
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