My husband found this little silicone thing in the sink while doing the dishes. I have no idea where it came from, but I swear I’ve seen it before. Any ideas?

Conclusion: Solving the Mystery and Preventing Future Losses
Discovering the small silicone object in our sink proved to be a valuable lesson in kitchen safety and appliance maintenance. Identifying a float valve gasket from our pressure cooker not only solved the mystery but also highlighted the importance of regular checks and good cleaning practices. To prevent future losses, we plan to be more vigilant when cleaning and are considering creating a dedicated area for small appliance parts. This experience reinforced the importance of every component, no matter how small, in ensuring the safe and efficient operation of our cookware.