An adapter for the small Buchner funnel I designed previously.
https://www.printables.com/model/380143-buchner-funnel-56mm-dia-filter-paper
There's a small 1mm hole to help you drill and tap for a barbed fitting. The ones I had on hand are 10-32 UNC but any size would do.
The main hole I made to accept one of those taper rubber bungs.
The author marked this model as their own original creation.