This design is a remix from the “(Kinda) Universal Bottle Cap”, as published by romagnum on Thingiverse: https://www.thingiverse.com/thing:3807593.
I've made the following changes:
As per romagnum's description, this cap should fit the thread type PCO 1881 (for most soda bottles) and the type of thread used by Chaudfontaine, SPA, and other brands of water bottles.
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The author remixed this model.