Many pumping moms feel a reduction in suction power during the lifetime of their breast pump, due to damaged, old, or worn-out pump parts. Your pumping routine should include periodically replacing pump parts. Use this Replacement Breast Shield Kit that has been designed and tested to work with your Z1 and provides all the essential pump parts that you need. Properly assembling your shield kit is essential to get the ideal performance while pumping. Zomee pumps, parts, and accessories are all BPA free, made from 100% food-grade silicone, and are manufactured in FDA compliant facilities.