Design Details That Make One Piece Valve Easier to Use and Validate

https://industrialrubbervalves.iamarrows.com/liquid-dispensing-valve-buying-guide-for-oem-packaging-projects

Designing a small part can affect the whole product. A one piece 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