A Clear Checklist for Planning a Successful Air Breathing Valve Project

https://dripcontroljournal.bearsfanteamshop.com/no-drip-valve-selection-guide-for-thick-and-thin-liquids

Designing a small part can affect the whole product. A air breathing valve may look simple, but it has a real job to do. It must work with the cap, case, fluid, air path, or light path around it