Common Elastomeric Valves Design Mistakes and How Product Teams Can Avoid Them

https://valveapplicationguide.huicopper.com/one-piece-valve-benefits-for-brands-seeking-clean-and-consistent-dispensing

Designing a small part can affect the whole product. A elastomeric valves 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