Why Prototype Testing Is Important for Custom NBR Valves

https://reliableflowparts.capitaljays.com/posts/a-practical-guide-to-choosing-a-silicone-valve-seal-for-modern-product-designs

Designing a small part can affect the whole product. A NBR 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