Lube cap

This is a screw-on cap for a plastic bottle (e.g [1]).) with a little air hole and a larger one to feed through a 3mm silicone hose (e.g. [2]).
It can be used as a supply for liquids.
For example as lube supply for certain milking machines.


[1]: https://www.amazon.de/Squeeze-Kunststoff-Quetschflasche-Condiment-Flaschen/dp/B09B3B9LXK
[2]: https://www.amazon.de/gp/product/B08MFRH48R