When we moved into our home, it had a radon mitigation system, with a pressure gauge, but the hose that connects the pressure gauge to a hole in the radon PVC pipe was missing.
I bought the smallest, sheapest hose I could find, but I couldn't find one that would fit both in the pre-dilled hole and the pre-installed gauge. So I made this simple adapter.
I included the Fusion 360 file, so you can adjust the two diameters (and other dimensions) so I suppose you could use it for other things too.
The author marked this model as their own original creation.