Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1980386.

This is not a crack pipe but a doser to aromatise sparkling water with syrup. It is designed for syrup bottles with PCO-1881 thread. Fully filled this doser dispenses an amount of 20 ml syrup sufficient for the content of a standard bottle for sparkling water makers of 860 ml.

It needs a bit exercise to use it but then it is easy to dose the syrup. The second picture shows how to fill the doser with syrup, the third picture the pouring out.

Edit 2016/12/21: New design V2. This design prevents the backflow of syrup out of the doser into the syrup bottle when pouring out.