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

https://flowcontroldesk.wpsuo.com/how-silicone-lenses-help-simplify-sealing-in-optical-assemblies

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