Many pumping moms experience a reduction in suction power over time due to worn-out or damaged pump parts. To maintain optimal performance, it is essential to periodically replace these parts. The Zomee Updated Fit Breast Shield Kit is designed and tested to work seamlessly with your Fit wearable breast pump, ensuring you have all the essential components for a smooth and efficient pumping experience. Properly assembling your breast shield kit is crucial for achieving the best performance while pumping. Zomee pumps, parts, and accessories are all BPA-free, made from 100% food-grade silicone, and manufactured in FDA-compliant facilities to ensure safety and quality. If your Fit pump requires a seal ring, this is the wrong kit for you. These parts are only compatible with the zomee fit. They will not work on other pumps.