Design Details That Make Silicone Valve Seal Easier to Use and Validate

https://siliconeflowdigest.almoheet-travel.com/why-a-liquid-dispensing-valve-matters-for-repeatable-dose-control

Designing a small part can affect the whole product. A silicone valve seal 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