How Custom Air Breathing Valve Can Solve Practical Packaging and Device Challenges
https://nbrvalvenotebook.iamarrows.com/why-silicone-valve-seal-quality-matters-in-food-and-beverage-closures
Many product issues start with a small detail that was not checked early. The air breathing valve is one of those parts that needs close care. A good part should fit well and act in a stable way