I lost the nozzles for a cheap air pump for air mattress, inflatable pool toys etc. I printed this one https://www.thingiverse.com/thing:2974667 but the diameter of the large end was too small for the pump. So I made a quick adapter that fits on the pump itself.

The inside diameter of the large opening is 38.3mm and the outside diameter of the small end is 29.25mm.