GL45 Schott Duran Bottle Cap with hole in a bent geometry.
I use it with a peristaltic pump in the lab to wash purification columns. The bend prevents the capillary tubing to slip out the bottle and destroy the column by flushing air.
Based on a cap model by JossyBoy (ThingyVerse, https://www.thingiverse.com/thing:3938399)
The author remixed this model.
Added Step file